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Teres Minor


- See Rotator cuff:

- anatomy:
    - origin: middle half of the lateral scapular border;
    - insertion: inferior aspect of greater tuberosity of the humerus, capsule of shoulder joint;

- action:
    - lateral rotation of humerus at the shoulder (responsible for 45% of power of external rotation);
    - aids in adduction and extension of humerus;
    - stabilization of head of humerus;
    - reversed origin insertion action: when the humerus is stabilized, abducts the inferior angle of the scapula;
    - synergists: infraspinatus, subscapularis;

- nerve supply: axillary, C4, C5, C6;
    - helps form the triangular space & quadrangular space;
    - w/ isolated teres minor atrophy consider quadrilateral space syndrome