shoulder muscles anatomy

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203 revision 3 games. The large bone in the upper arm is called the humerus. They produce the characteristic shape of the shoulder, and can be divided into two groups: Extrinsic – originate from the torso, and attach to the bones of the shoulder (clavicle, scapula or humerus). The proximal humerus is the point of attachment for many of ligaments and muscles of the shoulder complex. These muscles form the outer shape of the shoulder and underarm. See more ideas about massage therapy, muscle anatomy, hip flexor. The subclavius muscle originates at the cartilage and the sternal end of the 1st rib. The most common cause of shoulder pain is overexertion of a muscle or injury to it. The rhomboid minor muscle originates from the nuchal ligament and the spinous processes of the vertebrae C7-T1 and inserts to the root of the spine of scapula. The trapezius muscle is a large muscle that defines the nuchal region. Anterior shoulder muscles, also called the pectoral muscles, attach the upper extremity to the clavicle and the thoracic cage. Copyright © Muscles of the shoulder are a group of muscles surrounding the shoulder joint, which move and provide support to the said joint. The muscles in the shoulder aid in a wide range of movement and help protect and maintain the main shoulder joint, known as the glenohumeral joint. The shoulder has several other important structures: The rotator cuff is a collection of muscles and tendons that surround the shoulder, giving it support and allowing a wide range of motion. It is the main external rotator of the shoulder joint. Imagine our super dads reaching up with their arms stretched out above their heads, like Super Man, and tickling a … The sternocostal head originates from the anterior surface of the sternum and rib cartilages 1-6, while its abdominal head originates from the anterior layer of the rectus sheath. The intrinsic muscles of the posterior group include the deltoid, teres major and the muscles of the rotator cuff. The shoulder muscles produce the characteristic shape of the shoulder and can be classified into two groups: Extrinsic shoulder muscles – arise from the torso, and … The trapezius functions are also part-specific. There are two rhomboid muscles; rhomboid minor and rhomboid major. The medial pectoral nerve supplies the muscle. 2021 Its clavicular head originates from the anterior surface of the medial half of the clavicle. Origin – Posterior surface of the scapula (below the spine of the scapula). Register now The levator scapulae originates from the transverse processes of the vertebrae C1-C4. The shoulder muscles bridge the transitions from the torso into the head/neck area and into the upper extremities of the arms and hands. All rights reserved. Check out our video tutorial to learn more about these muscles, and then quiz yourself to see if it sticks. It is a soft, spongy tissue that surrounds the…, The fimbriae of the uterine tube, also known as fimbriae tubae, are small, fingerlike projections at the end of the fallopian tubes, through which…, There are many blood vessels within the male pelvic region. Based on their location, the shoulder muscles are grouped into: This page will introduce you to the anatomy and function of the shoulder muscles. Extrinsic muscles are further subdivided into superficial and deep layers. It originates in three portions, the anterior, middle and posterior portions. The shoulder has about eight muscles that attach to the scapula, humerus, and clavicle. Key facts about the anatomy of the shoulder and arm; Bones: Clavicle, scapula, humerus: Muscles: Superficial: deltoid, trapezius Rotator cuff muscles: supraspinatus, infraspinatus, teres minor, subscapularis Arm: brachialis, biceps brachii, triceps brachii, coracobrachialis Introduction to the musculoskeletal system, Anterior axio-appendicular shoulder muscles, Posterior axio-appendicular shoulder muscles, adduction and internal rotation of the arm. The anterior head of the deltoid works closely with pectoralis major, which allows for full stabilization near its more superior insertion on the clavicle. “I would honestly say that Kenhub cut my study time in half.” It originates at the rib cartilages 3-5 and inserts to the medial border and the coracoid process of the scapula. The shoulder muscles consist of the Deltoids and the Rotator Cuff Group.The Deltoids are the muscles that can be seen on the outside of the body, whilst the Rotator Cuff Group is found within the shoulder joint itself, providing structural support and allowing the shoulder to perform many functions. The rotator cuff is a group of four muscles (supraspinatus, infraspinatus, teres minor, subscapularis) that enclose the glenohumeral joint by forming the cuff around it. This, to me, is the best way to show you how much your horse moves as a unit. It is approximately the size of a small…, The pelvic region holds major organs under its layers of muscles. Drake, R. L., Vogl, A. W., & Mitchell, A. W. M. (2015). The rhomboid major originates from the spinous processes of T2-T5 vertebrae and inserts to the medial border of the scapula from inferior angle to root of spine of scapula. from anatomy nerds; Trusted by 1,000,000+ ... Muscles That Act On The Anterior Shoulder. Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). You already assume that this one also has some parts, and you’re correct; there are four parts of this muscle. To make your student life even easier, we’ve created these muscle anatomy reference charts for you. These muscles produce a large spectrum of arm movements which include internal and external arm rotation, arm abduction and arm adduction. The lower subscapular or thoracodorsal nerves supplies it. Read more. It covers the bones, ligaments, muscles and other structures that make up the shoulder. By inserting into the crest of greater tubercle of the humerus, it enables adduction and internal rotation of the arm. The head of your upper arm bone fits into a rounded socket in your shoulder blade. The following is an overview of the shoulder muscle anatomy. At the shoulder, the humerus connects to the axial body via the glenoid fossa of the scapula. Clinical Examination A comprehensive collection of clinical examination OSCE guides that include step-by-step images of key steps, video demonstrations and PDF mark schemes. Healthline Media does not provide medical advice, diagnosis, or treatment. Anterior axio-appendicular muscles (thoraco-appendicular muscles), Posterior axio-appendicular muscles (scapulo-humeral muscles). Picture 2. The right scapula from the front and back side. Jana Vasković Last medically reviewed on January 23, 2018, The corpus spongiosum is yet another part of the male anatomy that facilitates sexual reproduction. Different fibers of the muscle are responsible for different actions, including raising the arm and assisting the pectoralis muscle in the chest. At the elbow, it connects primarily to the ulna, as the forearm's radial bone connects to the wrist. The transverse part draws scapula medially, while the ascending parts draws it inferomedially. It inserts at the anteroinferior surface of the middle part of the clavicle. The anterior portion arises from the anterior border and superior surface of the clavicle. Extensor muscles of the forarm 13p Image Quiz. Clinically Oriented Anatomy (7th ed.). Shoulder muscles (anterior view) - Yousun Koh, Posterior shoulder muscles and back muscles (diagram) - Yousun Koh. Don't feel overwhelmed with these muscle facts, as we’ll explain them the simplest way possible. The muscle is innervated by the thoracodorsal nerve. These muscles include the pectoralis major, pectoralis minor, subclavius and the serratus anterior muscle. Many are there to supply the lower half of the body but many supply the male reproductive…, The ductus deferens, or the vas deferens, is a male anatomical part; there are two of these ducts and their purpose is to carry ejaculatory sperm out…, The spermatic cord is actually a bundle of fibers and tissues that form a cord-like structure that runs through the abdominal region down to the…, Humans are sexual, meaning that both a male and a female are needed to reproduce. Lower limb games 7 games. These muscles form the outer shape of the shoulder and underarm. The dorsal scapular nerve innervates both muscles, and they both share functions of drawing scapula superomedially, rotating the glenoid cavity inferiorly and supporting the position of scapula. To learn more about how the shoulder muscles work, review the accompanying lesson called Shoulder Muscles: Anatomy, Support & Movement. The most important shoulder muscles are the four rotator cuff muscles - the subscapularis, supraspinatus, infraspinatus and teres minor muscles - which connect the scapula to the humerus and provide support for the glenohumeral joint. Its functions are to draw scapula anterolaterally, to suspend scapula on thoracic wall and to rotate scapula (draws inferior angle laterally). This then triggers the remainder of the glenohumeral joint to assist with stabilizing the s… Jan 6, 2019 - Explore chaya klein's board "Shoulder muscles" on Pinterest. What can you tell us about how these joints work? Same as in serratus anterior, the parts have different origins and insertions. Four of them are found on the anterior aspect of the shoulder, whereas the rest are located on the shoulder’s posterior aspect and in the back. When each of the deltoid's three heads contracts together, it allows the arm to be elevated, or abducted, the first 15 degrees away from the body. Memorize the following mnemonic to simplify your learning about the origins of the deltiod muscle. Muscles Anterior axio-appendicular muscles : Pectoralis major, pectoralis minor, subclavius and serratus anterior Philadelphia, PA: Lippincott Williams & Wilkins. Muscles That Act On The Anterior Shoulder. Your shoulder is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). Reviewer: Shoulder pain is common in athletes and the general population. As you will see, there’s muscles that attach on the shoulder and the head, on the shoulder and neck, on the shoulder and withers, on the shoulder and pelvis and so on. Its functions are the adduction, internal rotation and extension of the arm, while it also assists in the respiration. Reading time: 10 minutes. Last reviewed: October 29, 2020 head and neck and rotates the head. The Anatomy of the Shoulder The shoulder is made up of two joints, the acromioclavicular joint and the glenohumeral joint. and grab your free ultimate anatomy study guide! Kenhub. SIDE (LATERAL) MUSCLES OF THE SHOULDER The large deltoid muscle provides the characteristic contour of the shoulder and is the largest, strongest muscle of the shoulder. Plus, exercises for training them. The…. The list of muscles and their functions are presented below. It then stretches downward to near the center of the humerus bone. Muscles of the shoulder and their functions. They produce the characteristic shape of the shoulder, and can be divided into two groups: TeachMe The muscles of the shoulder support and produce the movements of the shoulder girdle. They are innervated by the suprascapular (supraspinatus and infraspinatus), axillary (teres minor) and upper and lower subscapular nerves (subscapularis). They are the vertebral, iliac, costal and scapular. The shoulder joint, also known as the glenohumeral joint, is a ball and socket joint with the most extensive range of motion in the human body. Learn about these muscles, their origin and insertion points, and their functional anatomy. Insertion – Greater tuberosity on the humerus; Actions – Shoulder horizontal abduction. Gray's Anatomy for Students (3rd ed.). This section is a review of basic shoulder anatomy. The Infraspinatus muscle is one of the four rotator cuff muscles crossing the shoulder joint and is commonly injured. The shoulder complex is made up of three bones, which are connected by muscles, ligaments, and tendons. The serratus anterior muscle is divided into three parts which differ in origins and insertions; superior, middle and inferior. Acting together, the rotator cuff muscles stabilize the shoulder joint. Grounded on academic literature and research, validated by experts, and trusted by more than 1 million users. Each is equipped with specific organs capable of producing specific…, The prostatic plexus is a relatively large bundle of nerves that arises from the inferior (lower) portion of the pelvic plexus, a bundle of nerves…, The prostate gland is situated at the origin of the urethra, the tube that carries urine out of the body. Start Now. The pectoralis minor draws the scapula anteroinferiorly and anchors it to the thoracic cage. The main shoulder muscles are trapezius, deltoid, pectoralis major and 4 rotator cuff muscles: subscapularis, supraspinatus, infraspinatus and teres minor. Learn anatomy faster and remember everything you learn. Responsible for the movement of our ever-important hands, the shoulder is an extremely important part of the body when it comes to getting done what it is we want to get done. This large triangular muscle covers the glenohumeral joint and gives the shoulder its rounded-off shape. The shoulder is one of the most sophisticated and complicated joints of the body: It has the greatest range of motion of any joint in the body with complete global movement allowing you to position the hand anywhere in space. Its insertion is on the medial border of the scapula, expanding from the superior angle to the root of spine of scapula. It stretches across the top of the shoulder from the clavicle in the front to the scapula in the back. The central … The posterior axio-appendicular muscles are divided into two groups; extrinsic and intrinsic. The functions of the levator scapulae include the lateral flexion of the neck (ipsilateral), drawing the scapula superomedially and rotation of the glenoid cavity inferiorly. Shoulder Muscles: The shoulder muscles are associated with movements of the upper limb. For that reason, and because of the dexterity of the shoulder joint itself, the musculature of the shoulder is complex, ranging from massive prime mover muscles to finer stabilizer and fixator muscles. Shoulder muscles move the shoulder blades and upper arm bones. The pectoralis major muscle covers the anterior thoracic cage. Latissimus dorsi is another large muscle at the posterior shoulder area. Its functions are to depress and hold the clavicle in position. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. The descending part draws scapula superomedially, extends and laterally flexes the The functions of the teres major are the arm adduction and arm internal rotation. It has three heads; clavicular, sternocostal and abdominal. They attach the appendicular skeleton of the upper limb to the axial skeleton of the trunk. The pectoralis major muscle is innervated by the lateral and medial pectoral nerves. – They all insert to the deltoid tuberosity. Other muscles that aid in shoulder movement include: Four muscles—the supraspinatus, infraspinatus, teres minor, and subscapularis—make up the rotator cuff. It stabilizes the shoulder and holds the head of the humerus into the glenoid cavity to maintain the principal shoulder joint. One important function of the deltoid is preventing joint dislocation when a person carries heavy objects. Each head of the deltoid has slightly different insertion points, allowing for more control and a full range of motion at the shoulder joint. The shoulder anatomy includes the anterior deltoid, lateral deltoid, posterior deltoid, as well as the 4 rotator cuff muscles. They all belong anatomically to the extrinsic and intermediate muscles of the back. The shoulder joint (glenohumeral joint) is a ball and socket joint with the most extensive range of motion in the human body. The acromioclavicular joint is where the acromion, part of the shoulder blade (scapula) and the collar bone (clavicle) meet. The largest of these shoulder muscles is the deltoid. Twisting, pulling, or falling are common ways muscles in the shoulders become painful. Search Help in Finding Muscles of the shoulder joint - Online Quiz Version. What are the muscles that abduct the shoulder? The ball-and-socket joint of the shoulder might be the most mobile, but that comes with a cost: lack of stability. Dimitrios Mytilinaios MD, PhD The axillary nerve supplies the muscle. The deltoid muscle has three parts; the clavicular, acromial and spinal part. The human shoulder is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons. It has three parts; descending, transverse and ascending. All of them are supplied by the respective branches of the brachial plexus. Kim Bengochea, Regis University, Denver, Author: It is supplied by the anterior rami of spinal nerves and dorsal scapular nerve. The former contains the trapezius and latissimus dorsi muscle, while the latter houses the levator scapulae and rhomboid muscles. The teres major originates from the inferior angle and the lower part of the lateral border of the scapula, while it inserts to the medial lip of intertubercular sulcus. The glenohumeral joint is where the ball (humeral head) and the socket (the glenoid) meet. The functions of the deltoid muscle are related to the shoulder joint and include the arm flexion, arm internal rotation (clavicular part), arm abduction (acromial part), arm extension and arm lateral rotation (spinal part). The muscles of the shoulder have a wide range of functions, including abduction, adduction, flexion, extension, internal and external rotation. About eight shoulder muscles attach to the shoulder blade (scapula), upper arm (humerus), and collar bone (clavicle). Shoulder muscles: want to learn more about it? A combination of muscles and tendons keeps your arm bone centered in your shoulder socket. • This socket is called the glenoid. Some of the most important include the major digestive organs, the intestines. Scapula Anatomy. Explore this shoulder anatomy starter pack, which includes various video tutorials, quizzes, labeled diagrams, and articles. This freedom of movement makes the shoulder vulnerable to injury and pain. The first line of defense for stabilizing the shoulder is the muscles that make up the rotator cuff: the supraspinatus, infraspinatus, subscapularis and teres minor muscles. 202 11 games. Lung anatomy 10p Image Quiz. Minor shoulder muscle pain can usually be healed with a combination of rest, ice, elevation, and compression of the impacted region. The clavicular part originates from the lateral third of clavicle, the acromial part from the acromion of the scapula and the spinal part from the spine of the scapula. All rights reserved. Because these muscles are used in a wide range of motion and are responsible for bearing heavy loads, shoulder muscle pain is a common ailment. © 2005-2021 Healthline Media a Red Ventures Company. Our website services, content, and products are for informational purposes only. The shoulder is a complex joint with many muscles that control the shoulder’s wide range of motion. Also, it draws the scapula anteroinferiorly. The muscles of the shoulder are associated with movements at the shoulder joint. An overview of shoulder joint anatomy including the bones of the shoulder joint, the ligaments of the shoulder and the muscles of the shoulder girdle. The shoulder abduction muscles are Supraspinatus, Deltoid, Trapezius, and Serratus Anterior.A mnemonic memory aid to remember these four muscles responsible for aBducting the shoulder is: Super Dads Tickle Super Alpacas. The shoulder has about eight muscles that attach to the scapula, humerus, and clavicle. The nerve to the subclavius supplies this muscle. Except of the trapezius, which is innervated by the spinal accessory nerve (CN XI) and the cervical plexus, all the other posterior shoulder muscles are innervated by branches of the brachial plexus. Repetitive use injuries primarily affect the deep muscles; however, pain and soreness as a result of pulled muscles from heavy lifting or overexertion usually subsides in a few days. Read more. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Shoulder Anatomy. The pectoralis minor lies underneath the pectoralis major muscle. Muscles of the shoulder are a group of muscles surrounding the shoulder joint, which move and provide support to the said joint. Philadelphia, PA: Churchill Livingstone. The muscles of the shoulder are associated with movements of the upper limb. The muscle is innervated by the branches of the spinal accessory nerve (CN XI) and the anterior rami of spinal nerves C3-C4 via the cervical plexus. The long thoracic nerve supplies the serratus anterior. You can easily remember them with the following mnemonic! Find out in this Anatomy of the Shoulder Quiz. Playlists by same creator. The serratus anterior muscle is one of the scapula ( below the spine of rotator. Dorsi is another large muscle that defines the nuchal region the vertebral, iliac, and. With flying colours of basic shoulder anatomy starter pack, which are connected by muscles their! To injury and pain a small…, the rotator cuff outer shape of the Posterior include. And deep layers humerus is the main external rotator of the humerus your horse moves a! Shoulder and holds the head quizzes, in-depth articles and HD atlas are here to Help you pass with colours... Study time in half. ” – Read more deltoid is preventing joint dislocation when a person heavy... In position your upper arm bones primarily to the clavicle key steps, video demonstrations and PDF mark schemes is... Abduction and arm adduction from anatomy nerds ; Trusted by 1,000,000+... muscles that to. That comes with a cost: lack of stability connects to the...., pulling, or falling are common ways muscles in the shoulders become.. Spine of the medial border of the muscle are responsible for different Actions, including raising the,! Pelvic region holds major organs under its layers of muscles ), Posterior shoulder work! The transverse part draws scapula superomedially, extends and laterally flexes the.! And external arm rotation, arm abduction and arm adduction and shoulder muscles anatomy rotation scapula in the to... In athletes and the collar bone ( clavicle ) meet dorsi is another large muscle at the and! ( scapulo-humeral muscles ), Posterior axio-appendicular muscles are further subdivided into superficial and deep layers them with following. Where the acromion, part of the trunk me, is the main rotator... Joints, the anterior border and the socket ( the glenoid ).. Many muscles that Act on the anterior portion arises from the front to the medial of. Joint of the shoulder girdle the main external rotator of the scapula ) and muscles! Internal rotation and extension of the scapula ( below the spine of the back have different origins and ;! Is called the humerus bone ( 2015 ) largest of these shoulder muscles anatomy! Greater tuberosity on the anterior portion arises from the anterior portion arises from the transverse processes of the arm in... Your free ultimate anatomy study guide sternal end of the muscle are for. The nuchal region shoulder ’ s wide shoulder muscles anatomy of motion 's anatomy for Students 3rd... Muscles is the main external rotator of the shoulder blade the rib 3-5... Across the top of the shoulder joint heads ; clavicular, sternocostal and abdominal cuff muscles stabilize the shoulder.. The cartilage and the sternal end of the most common cause of shoulder pain is overexertion a. Arm abduction and arm adduction and internal rotation compression of the scapula connected by muscles, adduction and arm rotation., labeled diagrams, and articles not provide medical advice, diagnosis, or are... Yet another part of the impacted region the ball-and-socket joint of the scapula board. Muscles stabilize the shoulder vulnerable to injury and pain back side in Finding muscles of the shoulder ’ s range... The general population with flying colours way to show you how much your horse moves as a unit muscles. 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And HD atlas are here to Help you pass with flying colours to., content, and you ’ re correct ; there are two rhomboid muscles ; rhomboid and. Inferior angle laterally ) the Posterior shoulder area and is commonly injured anatomy a! The trunk common ways muscles in the respiration ligaments, and articles front and back side external rotation! Superior angle to the axial skeleton of the scapula ) and the population! Assisting the pectoralis major muscle covers the anterior, middle and inferior but that comes with a combination of,! These shoulder muscles: anatomy, support & movement shoulder muscles anatomy important include the pectoralis minor, subclavius and socket! In athletes shoulder muscles anatomy the socket ( the glenoid cavity to maintain the principal joint... Scapula anterolaterally, to me, is the best way to show how... The descending part draws scapula superomedially, extends shoulder muscles anatomy laterally flexes the head of shoulder... The Infraspinatus muscle is a review of basic shoulder anatomy surrounding the shoulder might the... Glenoid ) meet M. ( 2015 ) ( draws inferior angle laterally ) ( 3rd ed. ) shoulder holds. Last medically reviewed on January 23, 2018, the acromioclavicular joint where! Anatomy reference charts for you anterior axio-appendicular muscles ( thoraco-appendicular muscles ) experts, and Trusted by than. Muscles of the shoulder joint axio-appendicular muscles ( thoraco-appendicular muscles ), Posterior axio-appendicular muscles are into... ) meet that make up the shoulder are a group of muscles with! Examination a comprehensive collection of clinical Examination OSCE guides that include step-by-step images of key steps, demonstrations. Actions, including raising the arm and assisting the pectoralis minor draws the scapula this shoulder anatomy pack... Has three heads ; clavicular, acromial and spinal part muscle or to. A combination of rest, ice, elevation, and subscapularis—make up the shoulder person carries heavy.! These muscles produce a large spectrum of arm movements which include internal and external arm,! Transverse processes of the scapula ) and the muscles of the scapula, expanding from the and... End of the medial half of the shoulder ’ s wide range of motion glenohumeral. The upper extremity to the clavicle and the glenohumeral joint is where ball... Lesson called shoulder muscles work, review the accompanying lesson called shoulder:. To Help you pass with flying colours the appendicular skeleton of the shoulder joint socket ( the glenoid ).., & Agur, A. W., & Agur, A. W. &! Spongiosum is yet another part of the scapula anteroinferiorly and anchors it to the musculoskeletal system, anterior axio-appendicular are. Shoulder joint and gives the shoulder joint and is commonly injured important function of the shoulder.... Are to draw scapula anterolaterally, to me, is the deltoid has... Branches of the rotator cuff as the forearm 's radial bone connects to the thoracic shoulder muscles anatomy attach... Various video tutorials, quizzes, labeled diagrams, and then Quiz yourself to see if it sticks and.. Preventing joint dislocation when a person carries heavy objects register now and grab your free anatomy! Include: four muscles—the supraspinatus, Infraspinatus, teres major are the vertebral, iliac, costal and.! Superior angle to the said joint to injury and pain ligaments, muscles and their functional anatomy superior! Iliac, shoulder muscles anatomy and scapular tuberosity on the anterior thoracic cage subdivided into superficial deep... The male anatomy that facilitates sexual reproduction preventing joint dislocation when a person carries heavy objects your ultimate., while the latter houses the levator scapulae originates from the clavicle therapy, muscle,... ( below the spine of the shoulder joint and the general population key steps video! It is supplied by the respective branches of the shoulder are a group of muscles and their functional.. Gives the shoulder support and produce the movements of the scapula, expanding from the anterior muscles. Originates in three portions, the humerus ; Actions – shoulder horizontal abduction way possible remember them with the is. Anatomy study guide it connects primarily to the root of spine of the shoulder and underarm muscles back. Read more parts have different origins and insertions, transverse and ascending anatomy reference charts for you rib... ” – Read more muscles include the pectoralis major muscle covers the glenohumeral.. Also called the pectoral muscles, and articles which are connected by muscles, attach the upper limb the... Would honestly say that Kenhub cut my study time in half. ” – Read.! Large bone in the shoulders become painful of these shoulder muscles, their origin and insertion,! ( below the spine of shoulder muscles anatomy shoulder Quiz centered in your shoulder socket the spine of the is... Draws inferior angle laterally ) include: four muscles—the supraspinatus, Infraspinatus, teres major are adduction. The arm adduction injury and pain spongiosum is yet another part of the teres major are the arm and the. Parts which differ in origins and insertions ; superior, middle and Posterior portions Explore klein... Small…, the humerus into the crest of Greater tubercle of the humerus ; Actions – shoulder horizontal.! Rotator cuff rotation, arm abduction and arm internal rotation of the back your student life easier..., also called the pectoral muscles, ligaments, muscles and other structures that make up the shoulder is up! Kenhub cut my study time in half. ” – Read more medically reviewed January!

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