XX CONTENTS 



Page 



Evolution of the Aortic Arches 359 



Evolution of Arteries 361 



Evolution of Veins 361 



Evolution of Lymphatics 362 



Evolution of Hemopoietic Tissues 363 



Development of the Vascular System 366 



Changes in the Embryonic Circulation 376 



Development of the Veins 379 



Changes in Circulation at Birth 382 



Development of the Lymphatic System 384 



The Heart in Man 387 



Pulmonary Circulation in Man 389 



Systemic Circulation in Man 390 



The Lymphatic System in Man 397 



11. The Urogenital System 399 



Evolution of the Urogenital System 399 



The Urinary System 399 



The Reproductive System 407 



The Urogenital System of Man 415 



Urinary Organs 4^5 



Reproductive Organs 421 



Development of the Urogenital System 43° 



The Urinary System 43° 



Reproductive Organs 439 



12. The Endocrinal Organs 446 



The Pancreas 447 



The Gonads 448 



The Suprarenal Glands 45 1 



The Thyroid Gland 455 



The Parathyroid Glands 4S8 



The Ultimobranchial Bodies 460 



The Thymus 460 



The Pituitary Gland 462 



13. The Nervous System 467 



The Elements of the Nervous System 467 



The Organization of the Nervous System 474 



Nervous System of Chordates 477 



Evolution of the Brain. . 495 



Evolution of the Spinal Cord 5^4 



Evolution of the Peripheral Nervous System 522 



Evolution of the Cranial Nerves 524 



Evolution of the Spinal Nerves 532 



The Autonomic Nervous System 535 



Evolution of the Autonomic System 539 



Development of the Brain . 54° 



Development of the Spinal Cord 549 



Development of Peripheral Nerves 55 2 



Meninges . 5oi 



