The head of your upper arm bone fits into a rounded socket in your shoulder blade. Kim Bengochea, Regis University, Denver, Author: Shoulder pain is common in athletes and the general population. and grab your free ultimate anatomy study guide! Its functions are to depress and hold the clavicle in position. These muscles form the outer shape of the shoulder and underarm. 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. head and neck and rotates the head. Other muscles that aid in shoulder movement include: Four muscles—the supraspinatus, infraspinatus, teres minor, and subscapularis—make up the rotator cuff. This section is a review of basic shoulder anatomy. The former contains the trapezius and latissimus dorsi muscle, while the latter houses the levator scapulae and rhomboid muscles. • Your shoulder is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). The levator scapulae originates from the transverse processes of the vertebrae C1-C4. 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. 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. The lower subscapular or thoracodorsal nerves supplies it. There are two rhomboid muscles; rhomboid minor and rhomboid major. Find out in this Anatomy of the Shoulder Quiz. The pectoralis minor draws the scapula anteroinferiorly and anchors it to the thoracic cage. 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 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. Also, it draws the scapula anteroinferiorly. The following is an overview of the shoulder muscle anatomy. The acromioclavicular joint is where the acromion, part of the shoulder blade (scapula) and the collar bone (clavicle) meet. 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. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. The muscles of the shoulder have a wide range of functions, including abduction, adduction, flexion, extension, internal and external rotation. It stretches across the top of the shoulder from the clavicle in the front to the scapula in the back. 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 … Anterior axio-appendicular muscles (thoraco-appendicular muscles), Posterior axio-appendicular muscles (scapulo-humeral muscles). The pectoralis major muscle is innervated by the lateral and medial pectoral nerves. The shoulder complex is made up of three bones, which are connected by muscles, ligaments, and tendons. It originates at the rib cartilages 3-5 and inserts to the medial border and the coracoid process of the scapula. 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. Learn anatomy faster and remember everything you learn. – A combination of muscles and tendons keeps your arm bone centered in your shoulder socket. About eight shoulder muscles attach to the shoulder blade (scapula), upper arm (humerus), and collar bone (clavicle). 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. All rights reserved. See more ideas about massage therapy, muscle anatomy, hip flexor. The pectoralis minor lies underneath the pectoralis major muscle. All rights reserved. The most common cause of shoulder pain is overexertion of a muscle or injury to it. It is the main external rotator of the shoulder joint. Playlists by same creator. Learn about these muscles, their origin and insertion points, and their functional anatomy. They are the vertebral, iliac, costal and scapular. It stabilizes the shoulder and holds the head of the humerus into the glenoid cavity to maintain the principal shoulder joint. The shoulder joint (glenohumeral joint) is a ball and socket joint with the most extensive range of motion in the human body. Same as in serratus anterior, the parts have different origins and insertions. 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. They are innervated by the suprascapular (supraspinatus and infraspinatus), axillary (teres minor) and upper and lower subscapular nerves (subscapularis). The Anatomy of the Shoulder The shoulder is made up of two joints, the acromioclavicular joint and the glenohumeral joint. All of them are supplied by the respective branches of the brachial plexus. The muscles of the shoulder support and produce the movements of the shoulder girdle. Its insertion is on the medial border of the scapula, expanding from the superior angle to the root of spine of scapula. 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. Philadelphia, PA: Churchill Livingstone. The posterior axio-appendicular muscles are divided into two groups; extrinsic and intrinsic. Explore this shoulder anatomy starter pack, which includes various video tutorials, quizzes, labeled diagrams, and articles. The shoulder has about eight muscles that attach to the scapula, humerus, and clavicle. Muscles That Act On The Anterior Shoulder. These muscles include the pectoralis major, pectoralis minor, subclavius and the serratus anterior muscle. They attach the appendicular skeleton of the upper limb to the axial skeleton of the trunk. The large bone in the upper arm is called the humerus. The subclavius muscle originates at the cartilage and the sternal end of the 1st rib. The anterior portion arises from the anterior border and superior surface of the clavicle. Shoulder muscles move the shoulder blades and upper arm bones. Muscles of the shoulder and their functions. 2021 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. Its functions are to draw scapula anterolaterally, to suspend scapula on thoracic wall and to rotate scapula (draws inferior angle laterally). Arm rotation, arm abduction and arm adduction, teres minor, subclavius and the thoracic cage principal shoulder.. Mnemonic to simplify your learning about the origins of the shoulder blade ( scapula.... Associated with movements at the shoulder joint skeleton of the shoulder joint in. From anatomy nerds ; Trusted by more than 1 million users tendons keeps your arm bone fits into rounded! 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