BIO-17 Chapter Notes - Chapter 1: Acromioclavicular Joint, Humerus, Pectoralis Minor Muscle

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4 Dec 2020
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Anatomy ac joint: type i 17, type ii 43, type iii 40% Coracoacromial ligaments: type iii found in up to 80% of rc tears (compared with 3% in type i) Supraspinatus tendon: between 48-72% of shoulder pain in pcp office is subacromial impingement. Inferior glenohumeral (important when shoulder is abducted and externally rotated) Posterior (ext/er: pectoralis major (add/flex/ir, biceps (flex, triceps (ext, teres major (add/ir, latissimus dorsi (ext/add/ir) Intrinsic muscles of the shoulder region: rotator cuff-know what these do (abd/er/ir) Inferior (depress: levator scapulae (elev, pectoralis minor (depress, rhomboids (retract, serratus anterior (protract) Static shoulder stability: the shoulder consists of passive and dynamic stabilizers, the static stabilizers are: Ligaments: (superior glenohumeral, middle glenohumeral and inferior glenohumeral), Dynamic shoulder stability: the dynamic stabilizers are the rotator cuff muscles along with the long head of the biceps, the scapulothoracic stabilizers are the rhomboids, trapezius, serratus anterior, and the pectoralis minor.

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