CONTENTS xi 



The Convoluted Renal Tubules and Glomeruli 363 



The Renal Pyramids and Renal Columns 367 



Changes in the Position of the Kidneys 369 



The Urinary Bladder, Urethra, and Urogenital Sinus 370 



The Genital Glands 373 



The Germinal Epithelium and Genital Ridge 3*73 



Differentiation of the Genital Glands 375 



The Ovary 376 



The Testicle . . . 381 



Determination of Sex 382 



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



nephroi 383 



In the Female 383 



Oviduct. . 384 



Uterus and Vagina 385 



In the Male 386 



Changes in the Positions of the Genital Glands and the Development 



of their Ligaments 387 



Descent of the Testicles 389 



Descent of the Ovaries 392 



The External Genital Organs 393 



The Development of the Suprarenal Glands 396 



The Cortical Substance 397 



The Medullary Substance 397 



Anomalies 399 



References for Further Study 405 



CHAPTER XVI 



THE DEVELOPMENT OF THE INTEGUMENTARY SYSTEM 407 



The Skin 407 



The Nails - 409 



The Hair 410 



The Glands of the Skin 412 



The Mammary Glands 412 



Anomalies 4 J 4 



References for Further Study . . . . '*\ < 416 



CHAPTER XVII 



THE NERVOUS SYSTEM 417 



General Considerations 4 X 7 



General Plan of the Vertebrate Nervous System . .......... 420 



Spinal Cord and Nerves 4 2 7 



The Epichordal Segmental Brain and Nerves 429 



