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Encyclopedia > Glenohumeral

Glenohumeral joint
The right shoulder and Glenohumeral joint
Latin articulatio humeri
Gray's subject #82 315
MeSH Glenohumeral+Joint
Dorlands/Elsevier a_64/12161240

The glenohumeral joint, commonly known as the shoulder joint, is a synovial ball and socket joint and involves articulation between the glenoid fossa of the scapula (shoulder blade) and the head of the humerus (upper arm bone). Image File history File links Gray327. ... This article is about the body part. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... This article is about the body part. ... Synovial joints (or diarthroses, or diarthroidal joints) are the most common and most moveable type of joints in the body. ... A ball and socket joint (enarthrosis, spheroidal joint) is a joint in which the distal bone is capable of motion around an indefinite number of axes, which have one common center. ... Glenoid fossa redirects here, for the other use of Glenoid fossa please see mandibular fossa. ... Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ...

Contents

Movements

The glenoid fossa is shallow and contains the glenoid labrum which deepens it and aids in stability. With 120 degrees of unassisted flexion, the glenohumeral joint is the most mobile joint in the body. A labrum (Latin for lip) is the large vessel of a warm bath in the Roman thermae. ...


Scapulohumeral rhythm helps to achieve further range of movement.


The rotator cuff muscles of the shoulder produce a high tensile force, and help to pull the head of the humerus into the glenoid fossa. The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder. ...


Capsule

The glenohumeral joint has a loose capsule that is lax inferiorly and therefore is at risk of dislocation inferiorly. The long head of the biceps brachii muscle travels inside the capsule to attach to the supraglenoid tubercle of the scapula. The joint capsules or articular capsules form complete envelopes for the freely movable bone joints. ... Dislocation (joint dislocation) occurs when bones at a joint move from their normal position. ... In human anatomy, the biceps brachii is a muscle located on the upper arm. ... The supraglenoid tubercle is a region of the scapula to which the long head of the biceps brachii muscle attaches. ...


Because the tendon is inside the capsule, it requires a synovial tendon sheath to minimize friction.


A number of bursas in the capsule aid mobility. A bursa is also a fluid filled sac located between a bone and tendon which normally serves to reduce friction between the two moving surfaces. ...


Pathology

The capsule can become inflamed and stiff, with abnormal bands of tissue (adhesions) growing between the joint surfaces, causing pain and restricting movement of the shoulder, a condition known as frozen shoulder or adhesive capsulitis. An adhesion is a fibrous band of scar tissue that binds together normally separate anatomical structures. ... With frozen shoulder – as the name implies – movement of the shoulder is severely restricted. ...


External links

The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... eMedicine is an online clinical medical knowledge base that was founded in 1996. ...

Additional images


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