part of part of Homo sapiens temporal bone bone foramen hiatus and groove of petrous part of temporal bone for greater petrosal nerve 2026-03-19T00:00:00Z A bone foramen and associated groove on the anterior surface of the petrous part of the temporal bone, through which the greater petrosal nerve emerges from the geniculate ganglion of the facial nerve (CN VII) and courses anteromedially toward the foramen lacerum and pterygoid canal. David Osumi-Sutherland