X CONTENTS 



PAGE 



III. The Venous System ........... 363 



The Anterior Vence Cavce 363 



The Omphalomesenteric Veins 364 



The Umbilical Veins 367 



The System of the Inferior Vena Cava 368 



IV. The Embryonic Circulation 372 



CHAPTER XIII. THE URINOGENITAL SYSTEM ... 378 



I. The Later History of the Mesonephros 378 



II. The Development op the Metanephros or Permanent 



Kidney 384 



The Metanephric Diverticulum 384 



The Nephrogenous Tissue of the Metanephros . . . 387 



III. The Organs of Reproduction 390 



Development of Ovary and Testis 391 



Development of the Genital Ducts 401 



IV. The Suprarenal Capsules 403 



Origin of the Cortical Cords 405 



Origin of the Medullary Cords 406 



CHAPTER XIV. THE SKELETON 407 



I. General 407 



II. The Vertebral Column . . 411 



The Sclerotomes and Vertebral Segmentation . . . . 412 



Membranous Stage of the Vertebrce 414 



Chondrification 418 



Atlas and Axis (Epistropheus) 420 



Formation of Vertebral Articulations 421 



Ossification 421 



III. Development of the Ribs and Sternal Apparatus. . 424 



IV. Development of the Skull 427 



Development of the Cartilaginous or Primordial Cranium. 428 



Ossification of the Skull 432 



V. Appendicular Skeleton 434 



The Fore-limb 434 



The Skeleton of the Hind-limb 438 



APPENDIX 



General Literature ..... 443 



Literature — Chapter I 443 



Literature — Chapter II ....,... = •• • 444 



Literature — Chapter III 445 



Literature — Chapters IV and V 445 



