shoulder joint

As a ball and socket synovial joint, there is a wide range of movement permitted: The shoulder joint is one of the most mobile in the body, at the expense of stability. The glenohumeral joint is the ball-and-socket junction of the top of the arm bone, and the socket of the shoulder blade. Indeed, so-called ‘reverse Hill-Sachs lesions’ (impaction fracture of anteromedial humeral head) and ‘reverse Bankart lesions’ (detachment of posteroinferior labrum) can be seen in posterior dislocations. The shoulder joint (glenohumeral joint) is a ball and socket joint between the scapula and the humerus. Past 90 degrees, the scapula needs to be rotated to achieve abduction – that is carried out by the trapezius and serratus anterior. To access the TeachMeAnatomy 3D Model, you must be a premium subscriber. Your humerus bone fits underneath and inside of your scapula, or shoulder blade, and … The rotator cuff muscles have a very important role in stabilising the glenohumeral joint. How To Become a Children's Physical Therapist, How To Become a Vocational Rehabilitation Counselor. It extends from the anatomical neck of the humerus to the border or 'rim' of the glenoid fossa. Try again to score 100%. He served as assistant team physician to Chivas USA (Major League Soccer) and the United States men's and women's national soccer teams. There was an error submitting your subscription. The many possibilities are owed to the anatomy involved in allowing your shoul… A second joint on the top of the shoulder is where a different part of the shoulder blade, the acromion, connects to the collarbone. The rotator cuff is important in many routine activities, and when injured can cause severe pain. Your shoulder is arranged in a ball-and-socket joint configuration. The labrum also serves as the attachment of a major tendon in the shoulder, the biceps tendon. Where the rounded top of the arm bone (humerus) contacts the shoulder blade is called the glenohumeral joint. Our 3D anatomical model provides you with hands-on, interactive and valuable learning tool right here on your device. It is a flat, gliding joint that gives the shoulder joint additional flexibility that would not be possible with just the glenohumeral joint. The transverse humeral ligament is not shown on this diagram. The acromioclavicular joint is formed by an articulation between the lateral end of the clavicle and the acromion process of the scapula. 2016;17(1):340. doi:10.1186/s12891-016-1190-9, Ⓒ 2020 About, Inc. (Dotdash) — All rights reserved, Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. An anterior dislocation is usually caused by excessive extension and lateral rotation of the humerus. Labral tears are usually classified based on their location. Continue Scrolling To Read More Below... Join our Newsletter and receive our free ebook: Guide to Mastering the Study of Anatomy. Innerbody Research does not provide medical advice, diagnosis, or treatment. The medical information on this site is provided as an information resource only, and is not to beused or relied on for any diagnostic or treatment purposes. The rotator cuff is a group of four muscles and tendons that surround the glenohumeral joint. Most shoulder motion occurs at the ball-and-socket glenohumeral joint, but for full motion of the shoulder, the acromioclavicular joint must also be functioning normally. The shoulder capsule surrounds the ball-and-socket part of the shoulder joint. In this article, we shall look at the anatomy of the shoulder joint and its important clinical correlations. The scapula has one part that forms a socket for the ball-and-socket shoulder joint; this is called the glenoid. Make the changes yourself here! Original Author(s): Oliver Jones Last updated: December 8, 2018 This gives rise to the alternate name for the shoulder joint – the glenohumeral joint. The shoulder joint is formed by the articulation of the head of the humerus with theglenoid cavity(or fossa) of the scapula. The rotator cuff muscles are important in movements of the ball-and-socket shoulder joint. Your shoulders are the joints where your upper-arm bones (humerus), shoulder blades (scapula), and collarbone (clavicle) meet. Some of these other muscles are also critical to normal shoulder function. When the rotator cuff is inflamed or irritated, this is referred to as rotator cuff tendonitis or shoulder bursitis. The shoulder joint is supplied by the anterior and posterior circumflex humeral arteries, which are both branches of the axillary artery. Although both of these joints are held together by extensive ligament and muscle attachments, certain types of force can easily weaken the shoulder. The axillary nerve runs in close proximity to the shoulder joint and around the surgical neck of the humerus, and so it can be damaged in the dislocation or with attempted reduction. The most common labral tears are those associated with a shoulder dislocation, called a Bankart tear, and those associated with biceps tendon problems, called SLAP tears. The synovial membrane lines the inner surface of the joint capsule, and produces synovial fluid to reduce friction between the articular surfaces.

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