xii CONTENTS. 



The Urinary Bladder, Urethra, and Urogenital Sinus 403 



The Genital Glands 406 



The Germinal Epithelium and Genital Ridge 4°6 



Differentiation of the Genital Glands, 4°8 



The Ovary 4°9 



The Testicle . ... . .... . . 414 



Determination of Sex 415 



The Ducts of the Genital Glands and the Atrophy of the Meso- 



nephroi . • • ■ • 417 



In the Female . ... • 4*7 



Oviduct ... .418 



Uterus and Vagina . . . . • • 419 



In the Male . . . . -420 



Changes in the Positions of the Genital Glands and the Development 



of thfiir .Ligaments . . . • ■ 4 2 * 



Descent of the Testicles . ■ 4 2 3 



Descent of the Ovaries • • 4 2 6 



The External Genital Organs. . . .... 427 



The Development of the Suprarenal Glands 430 



The Cortical Substance . . . . . . . 431 



The Medullary Substance . . . .431 



Anomalies .... .... 433 



Practical Suggestions . . 439 



References for Further Study . ... 441 



CHAPTER XVI. 



The Development of the Integumentary System . . . 444 



The Skin .... . ■ • 444 



The Nails .... . 446 



The Hair . . . 447 



The Glands of the Skin ... . 449 



The Mammary Glands *".... 449 



Anomalies .... . .... 451 



Practical Suggestions . ... 453 



References for Further Study . 453 



CHAPTER XVII. 



The Nervous System . . . 454 



General Considerations 454 



General Plan of the Vertebrate Nervous System 457 



Spinal Cord and Nerves 464 



The Epichordal Segmental Brain and Nerves .......... 466 



The Cerebellum 473 



The Mid-Brain Roof 474 



The Prosencephalon. ..... 474 



