part of part of Homo sapiens humerus bone fossa coronoid fossa of humerus 2026-03-19T00:00:00Z A bone fossa situated on the anterior surface of the distal humerus, immediately superior to the medial trochlea, that accommodates the coronoid process of the ulna at full elbow flexion. It is separated from the olecranon fossa on the posterior surface only by a thin plate of bone. David Osumi-Sutherland