The base of the brain. The cerebral hemispheres are seen overlapping all the rest. Labels: I, olfactory lobes; II, optic tract passing to the optic commissure from which the optic nerves proceed; III, the third nerve or motor oculi; IV, the fourth nerve or patheticus; V, the fifth nerve or trigeminalis; VI, the sixth nerve or abducens; VII, the seventh or facial nerve or portio dura; VIII, the auditory nerve or portio mollis; IX, the ninth or glosso-pharyngeal; X, the tenth or pneumogastric or vagus; XI, the spinal accessory; XII, the hypoglassal; ncI, the first cervical spinal nerve.

The Base of the Brain

The base of the brain. The cerebral hemispheres are seen overlapping all the rest. Labels: I, olfactory…