Vlll CONTENTS 



PAGE 



The Esophagus, Stomach and Intestine 170 



The Liver 176 



The Pancreas 179 



The Body Cavities, Diaphragm and Mesenteries 180 



CHAPTER VIII. THE UROGENITAL SYSTEM 196 



The Pronephros. 196 



The Mesonephros 198 



The Metanephros 200 



The Cloaca, Bladder, Urethra and Urogenital Sinus 206 



The Genital Glands and Ducts 209 



The External Genitalia 225 



The Uterus during Menstruation and Pregnancy 230 



The Decidual Membranes 232 



The Placenta 237 



The Relation of Fetus to Placenta 241 



CHAPTER IX. THE VASCULAR SYSTEM 243 



The Primitive Blood Vessels and Blood Cells 243 



Haemopoiesis 243 



Development of the Heart 247 



The Primitive Blood Vascular System 259 



Development of the Arteries 262 



Development of the Veins 268 



The Fetal Circulation and Changes at Birth 276 



The Lymphatic System 278 



Lymph and Haemolymph Glands 280 



The Spleen 280 



CHAPTER X. HISTOGENESIS 282 



The Entodermal Derivatives 282 



The Mesodermal Tissues 283 



The Ectodermal Derivatives 293 



The Nervous Tissues 299 



CHAPTER XI. 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 



The Spinal Nerves 35-1 



The Cerebral Nerves. .......'.'..'."..'..'....... i 357 



The Sympathetic Nervous System 366 



The Chromaffin Bodies and Suprarenal Gland 368 



The Sense Organs 370 



INDEX.. 



393 



