Definition: intrinsic (scapulohumeral) muscle of shoulder joint, the tendon of which contributes to the rotator cuff; origin, supraspinous fossa of scapula; insertion, greater tuberosity of humerus; action, initiates abduction of arm; its tonic contraction helps to hold the head of the humerus in the shallow glenoid fossa; nerve supply, suprascapular from fifth and sixth cervical.
Synonym(s): musculus supraspinatusTA, supraspinous muscle
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