trigeminal nerve, arising just behind the optic nerve, giving rise to the following branches:—

(i) The ophthalmic nerve, which passes over the muscles of the eye and supplies the skin in the region of the olfactory capsule.

(ii) The maxillary nerve, which runs forward under the eyeball, and supplies the skin covering the upper jaw.

(iii) The mandibular nerve, which is at first continuous with the maxillary, and then bends round the inner surface of the upper jaw to extend along the outer surface of the mandible.

(d) The glossopharyngeal and the vagus (or pneumogastric) nerves, leaving the skull together, immediately behind the auditory capsule. The glossopharyngeal passes along in front of the hypoglossal nerve and proceeds along the base of the tongue. The vagus, after giving off branches to the dorsal muscles, reaches the walls of the pharynx and run obliquely backwards to supply the pharynx, heart, lungs and stomach.