II. The Peripheral Nervous System 369 1. Cranial Nerves 369 I. Olfactory Nerve 369 II. Optic Nerve 369 III. Oculomotor Nerve 369 IV. Trochlear Nerve 370 V. Trigeminal Nerve 370 VI. Abducens 375 VII. Facial Nerve 375 VIII. Auditory Nerve 377 IX. Glossopharyngeal Nerve 378 X. Vagus Nerve 378 XI. Accessory Nerve 382 XII. Hypoglossal Nerve 383 2. Spinal Nerves 383 _A._ Cervical Nerves 383 The Brachial Plexus 386 _B._ Thoracic Nerves 393 _C._ Lumbar Nerves 394 Lumbar Plexus 395 _D._ Sacral Nerves and Sacral Plexus 399 _E._ Nerves of the Tail 404 3. Sympathetic System 404 SENSE ORGANS AND INTEGUMENT 409 I. The Eye 409 II. The Ear 415 III. Olfactory Organ 426 IV. Organ of Taste 426 V. Integument 427 APPENDIX: PRACTICAL DIRECTIONS 429 INDEX 473 LIST OF ILLUSTRATIONS. FIG. PAGE