II. The Arteries 280 1. Pulmonary Artery 280 2. Aorta 281 _A._ Thoracic Aorta and its Branches 281 Common Carotid Artery 283 Subclavian Artery 290 _B._ Abdominal Aorta and its Branches 301 External Iliac Artery and its Branches 309 III. The Veins 315 1. Veins of the Heart 315 2. Vena Cava Superior and its Branches 316 Veins of the Brain and Spinal Cord 324 3. Vena Cava Inferior and its Branches 325 Portal Vein 326 IV. Lymphatic System 330 1. Lymphatics of the Head 331 2. Lymphatics of the Neck 332 3. Lymphatics of the Thoracic Limbs 332 4. Lymphatics of the Thorax and Abdomen 333 5. Lymphatics of the Pelvic Limbs 334 THE NERVOUS SYSTEM 335 I. The Central Nervous System 336 1. Spinal Cord 336 2. The Brain 339 (1) Myelencephalon 344 (2) Metencephalon 347 (3) Mesencephalon 351 (4) Diencephalon 352 (5) Telencephalon 357