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(A,B) Human embryo OY-4 (6 mm CR; O'Rahilly stage 13). Transverse sections. Delimitation of the presumptive stapedial area (arrows). Anterior cardinal vein (C). Otic vesicle (O). Facio-vestibulocochlear ganglion (FG). Glosopharyngeal nerve (G). Vagus nerve (V). The hyoid artery (H) is derived from the internal carotid artery (IC). The hyoid artery penetrates the mesenchyme of the second branchial arch (A). First pharyngeal pouch (P).
