Just external to the foramen magnum is a small foramen for the exit of the hypoglossal nerve (figs. 44 and 45, XII).
Some branches of the cervical plexus, and the hypoglossal nerve are also shown.
hypoglossal nerve n. Either of a pair of nerves that arise from the medulla, pass through the hypoglossal canal, and supply muscles of the tongue and the styloglossus, hyoglossus, and genioglossus muscles. Also called twelfth cranial nerve.