part of part of Homo sapiens scapula scapular spine of scapula 2026-03-19T00:00:00Z A prominent, triangular skeletal element projection arising from the posterior surface of the scapula and running obliquely from the medial border to the acromion, dividing the posterior scapular surface into the supraspinous and infraspinous fossae and providing attachment for the trapezius and deltoid muscles. skeletal element projection David Osumi-Sutherland