Anatomy
The spine projects back from the dorsal part of the triangular scapula, about 3/4 way up, dividing the dorsal surface into small supraspinous fossa above and large infraspinous fossa below. Starting from flush with the medial (vertebral) border, it rises and thickens, becoming the acromium at its lateral (axillary) end/border.
Clinical
Many muscles attach; at (trapezius, deltoid), above (supraspinatus) and below (infraspinatus, teres major and minor).
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