Xli CONTENTS. 



The Urinary Bladder, Urethra, and Urogenital Sinus 403 



The Genital Glands 406 



The Germinal Epithelium and Genital Ridge 406 



Differentiation of the Genital Glands, 408 



The Ovary -. 409 



The Testicle 414 



Determination of Sex 415 



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



nephroi 417 



In the Female 417 



Oviduct 418 



Uterus and Vagina 419 



In the Male 420 



Changes in the Positions of the Genital Glands and the Development 



of their Ligaments 421 



Descent of the Testicles 423 



Descent of the Ovaries 426 



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 





