HUMB1004 Study Guide - Final Guide: Coracoacromial Ligament, Suction Cup, Articular Disk
4 Aug 2018
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Document Summary
Tight when the arm is at the side + prevents humerus from moving inferiorly. Loose fibrous later of joint capsule surrounds the joint. From root of coracoid process + supraglenoid tubercle of scapula: medial attachment glenoid cavity + anatomical neck of humerus. Inferior part of the capsule is weakest + slack, it is only pulled tightly when the arm is elevated/flexed past horizontal: synovial membrane lines the internal surface of capsule and forms a tubular sheath that. Encloses the tendon of the long head of the biceps brachii. This ensures smooth movement of biceps in the intertubercular groove: fibrous capsule thickens to form ligaments . Posterior capsule is very week, only anterior, superior and inferior parts form ligaments: superiorly superior glenohumeral ligament, anteriorly middle glenohumeral ligament (strongest, prevents head of humerus from translating anteriorly) Inferiorly inferior glenohumeral ligament (weak, only supplied by joint capsule thickening) Inferior part of medial clavicle fits poorly into the clavicular notch so has fibrocartilage.
