CONTENTS IX 



Page 



Evolution of the Aortic Arches 275 



Evolution of Arteries 277 



Evolution of Veins 277 



Evolution of Lymphatics 278 



Development of the Heart 279 



Development of the Aortic Arches 282 



The Heart in Man 283 



Pulmonary Circulation in Man 288 



Systemic Circulation in Man 288 



The Lymphatic System in Man 288 



11. The Urogenital System 290 



Evolution of the Urogenital System 290 



The Urogenital System of Man 304 



Development of the Urogenital System 315 



12. The Endocrinal Organs 324 



The Pancreas 325 



The Gonads 326 



The Suprarenal Glands 327 



The Thyroid Gland 329 



The Parathyroid Glands 33^ 



The Ultimobranchial Bodies 333 



The Thymus 333 



The Pituitary Gland 334 



13. The Nervous System 33^ 



The Elements of the Nervous System 338 



The Organization of the Nervous System 345 



Nervous System of Chordates 34^ 



Evolution of the Brain 362 



Evolution of the Spinal Cord 3^7 



Evolution of the Peripheral Nervous System 372 



Evolution of the Cranial Nerves 374 



Evolution of the Spinal Nerves 37^ 



The Autonomic Nervous System 377 



Evolution of the Autonomic System 382 



Development of the Brain 3^3 



Development of the Spinal Cord 3^6 



Development of Motor Nerves 3^^ 



Meninges 39 1 



