AT 115 Lecture Notes - Lecture 20: Thoracic Vertebrae, Group For The Study Of Reactive Motion, Supraspinatus Muscle

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Document Summary

Scapula and clavicle: two bones primarily involved in movements of the shoulder girdle, clavicular articulation with the sternum is the only bony link to the axial skeleton, they move as a unit. Shoulder girdle (scapulothoracic: the scapula moves on the rib cage, joint motion occurs at the sternoclavicular joint. Sternoclavicular (sc) joint: multiaxial anthrodial joint, supported anteriorly by the sternoclavicular ligament. Acromioclavicular (ac) joint: arthrodial joint, supported superiorly and inferiorly by the acromioclavicular ligaments, what is injured during shoulder separation. Scapulothoracic joint: not a true synovial joint, has no ligamentous support, supported dynamically by muscles, movement is totally dependent on sc and ac joints, which allow the scapula to move. Retraction (adduction: muscles located medially on the back. The shoulder girdle and the shoulder joint work together in carrying out upper extremity activities. The shoulder girdle muscles stabilize the scapula so that the shoulder joint muscles will have a stable base.

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