BME 20100 Lecture Notes - Lecture 10: Proximal Radioulnar Articulation, Biceps, Trochlear Notch

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The shoulder joint is a synovial joint formed by the articulation of the glenoid cavity of the scapula and the head of the humerus. It is a ball and socket joint that allows movement in all directions. However, in quadrupeds most motion takes place in cranial/caudal plane. The shoulder joint is located topographically by palpating the acromion and greater tubercle. The flexor surface is the caudal aspect of the shoulder joint. The shoulder joint is somewhat stabilized by lateral and medial glenohumeral ligaments, thickenings of the fibrous layer of the shoulder joint capsule. The majority of shoulder joint stability comes from the surrounding musculature. Craniomedially the joint capsule surrounds the tendon of the biceps brachii, forming a tendon sheath. Note that the tendon of the biceps brachii runs between bone (humerus) and a retinaculum-like structure (transverse humeral ligament). So it makes sense that a tendon sheath is formed in this area.

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