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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 chiasma from which the optic nerves proceed; III, the third nerve or motor oculi; IV, the fourth nerve or patheticus; V, the fifth nerve or trigminalis; VI, the sixth nerve or abducens; VII, the seventh or facial nerve; VIII, the auditory nerve; IX, the ninth or glossopharyngeal; X, the tenth or pneumogastric or vagus; XI, the spinal accessory; XII, the hypoglossal; ncI, the first cervical spinal nerve.

Base of the Brain

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

The eyeballs and their muscles as seen when the roof of the orbit has been moved and the fat in the cavity has been partly cleared away. On the right side the superior rectus muscle has been cut away. Labels: a, external rectus; s, superior rectus; i, internal rectus; t, superior oblique.

The Eyeballs and Their Muscles

The eyeballs and their muscles as seen when the roof of the orbit has been moved and the fat in the…

The optic chiasma or commissure, which is seen at the base of the brain in front of the tuber cinereum and behind the lamina cinerea. It contains 4 sets of fibers.

The Optic Chiasma

The optic chiasma or commissure, which is seen at the base of the brain in front of the tuber cinereum…