BIOL 212 Lecture Notes - Lecture 11: Shoulder Girdle, Upper Limb, Sternoclavicular Joint
Document Summary
Lecture #11 - upper limbs musculoskeletal: pectoral girdle - has flexibility, lacks stability, upper limb bones are attached to axial skeleton by pectoral girdle. Scapula: articulates with clavicle, make sure to know the diagram of it, sternoclavicular joint, pectoral girdle only has anterior attachment to axial skeleton, upper appendicular skeleton attached by sternoclavicular joint, this is a synovial gliding joint. Shoulder separation: not the same as dislocation, usually due to a downward force over the acromion, can result in torn acromioclavicular ligament. [aka acl: severe shoulder separation, can result in torn acl and torn coracoclavicular ligament, x-rays show acl separation - the piano key" sign the clavicle springs" up. Making a cuff of tendons to help provide stability, to keep the head of the humerus from gliding up (1) Subscapularis muscle: extra reinforcement comes from the biceps brachii [long head] tendon runs intrascapular.
