part of part of Homo sapiens temporal bone bone foramen mastoid notch of mastoid part of temporal bone 2026-03-19T00:00:00Z A bone foramen forming a deep groove on the medial surface of the mastoid process, immediately medial to the mastoid process tip. It provides attachment for the posterior belly of the digastric muscle and lies lateral to the groove for the occipital artery. David Osumi-Sutherland