v iii CONTENTS 



PAGE 



The Esophagus, Stomach and Intestine r ? 



The Liver [ 



The Pancreas * '* 



The Body Cavities, Diaphragm and Mesenteries 



CHAPTER VIII. THE UROGENITAL SYSTEM l< fi 



The Pronephros J9 



The Mesonephros 



The Metanephros 2M . 



The Cloaca, Bladder, Urethra and Urogenital Sinus 2 



The Genital Glands and Ducts 2O ? 



The External Genitalia 22 5 



The Uterus during Menstruation and Pregnancy 230 



The Decidual Membranes 2 3 2 



The Placenta 2 37 



The Relation of Fetus to Placenta 241 



CHAPTER IX. THE VASCULAR SYSTEM 2 43 



The Primitive Blood Vessels and Blood Cells 243 



Haemopoiesis 243 



Development of the Heart 2 47 



The Primitive Blood Vascular System 259 



Development of the Arteries 2 62 



Development of the Veins 2 68 



The Fetal Circulation and Changes at Birth , 276 



The Lymphatic System 278 



Lymph and Hffimolymph Glands 280 



The Spleen 280 



CHAPTER X. HISTOGENESIS 2 82 



The Entodermal Derivatives 282 



The Mesodermal Tissues 283 



The Ectodermal Derivatives 2 93 



The Nervous Tissues 299 



CHAPTER XL THE MORPHOGENESIS OF THE SKELETON AND MUSCLES 309 



The Skeletal System 309 



The Axial Skeleton 309 



The Appendicular System 315 



The Muscular System 316 



CHAPTER XII. THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM 321 



The Spinal Cord 322 



The Brain 326 



The Differentiation of the Subdivisions of the Brain 332 



CHAPTER XIII. THE PERIPHERAL NERVOUS SYSTEM 353 



ThejSpinal Nerves 353 



The Cerebral Nerves 357 



The Sympathetic Nervous System 366 



The Chromaffin Bodies and Suprarenal Gland 368 



The Sense Organs 370 



INDEX. 



393 



