8 CONTENTS 



PAGE 



The Anatomy of a 10 mm. Pig Embryo 120 



External Form 1 20 



Central Nervous System and Viscera 122 



Heart and Blood Vessels 128 



The Study of Transverse Sections 132 



CHAPTER VI. METHODS OF DISSECTING PIG EMBRYOS: DEVELOPMENT OF THE FACE, PALATE, 



TONGUE, TEETH AND SALIVARY GLANDS 145 



Directions for Dissecting Pig Embryos 145 



Lateral Dissections of 6-35 mm. Embryos 146 



Median Sagittal Dissections 148 



Ventral Dissections 153 



Development of the Face in Pig and Human Embryos 153 



Development of the Hard Palate 155 



Development of the Tongue 158 



Development of the Salivary Glands 161 



Development of the Teeth 162 



CHAPTER VII. ENTODERMAL CANAL AND ITS DERIVATIVES 168 



The Pharyngeal and Cloacal Membranes 168 



Pharyngeal Pouches and their Derivatives 168 



The Thymus Gland 171 



The Epithelial Bodies or Parathyreoids 172 



The Thyreoid Gland 172 



Larynx, Trachea and Lungs 173 



Digestive Canal 177 



Digestive Glands : Liver 183 



Pancreas 186 



Body Cavities, Diaphragm and Mesenteries 188 



Primitive Coelom and Mesenteries 188 



Septum Transversum 191 



Pleuro-pericardial and Pleuro-peritoneal Membranes 192 



Diaphragm and Pericardial Membrane 195 



Omental Bursa, or Lesser Peritoneal Sac 197 



The Mesenteries 200 



CHAPTER VIII. UROGENITAL SYSTEM 203 



Pronephros 203 



Mesonephros 205 



Metanephros 207 



Nephrogenic Tissue 210 



Cloaca, Bladder, Urethra and Urogenital Sinus 213 



Genital Glands and Ducts 216 



Testis * . 218 



Ovary 221 



Union of Genital Glands and Mesonephric Tubules 225 



Uterine Tubes, Uterus and Vagina 226 



Ligaments of the Internal Genitalia 228 



Descent of Testis and Ovary 230 



External Genitalia 232 



Male and Female Genitalia Homologized . 235 



The Uterus during Menstruation and Pregnancy 238 



The Decidual Membranes 239 



Chorion Laeve and Frondosum 243 



Decidua Vera 243 



Decidua Capsularis 244 



The Placenta 245 



The Relation of Fetus to Placenta 249 



CHAPTER LX. VASCULAR SYSTEM 251 



The Primitive Blood-vessels and Blood-cells 251 



Erythrocytes 2 5 2 



Leucocytes 2 53 



Blood plates 2 54 



The Development of the Heart 



Primitive Blood Vascular System 



Development and Transformation of the Aortic Arches 270 



Vertebral and Basilar Arteries 272 



Segmental Arteries 2 74 



Umbilical and Iliac Arteries 275 



