CHAPTER V 



THE LATER DEVELOPMENT OF THE CHICK: 

 ORGANOGENY 



PAGE 



I. THE NERVOUS SYSTEM 302 



1. The Central Nervous System 302 



2. The Cranial and Spinal Ganglia 309 



3. The Peripheral Nervous System 311 



A. The Spinal Nerves and the Sympathetic System . . 311 



B. The Cranial Nerves . 313 



II. THE SPECIAL SENSE ORGANS . . . 316 



1. The Eye v . 316 



2. The Ear 321 



3. The Olfactory Organ 325 



III. THE ALIMENTARY TRACT AND ITS APPENDAGES . . 326 



1. The Organs of the Fore-gut . , . 326 



2. The Organs of the Hind-gut 334 



3. The Mid-gut 334 



IV. THE VASCULAR SYSTEM ' ' 336 



1. The Heart i . . . 337 



2. The Aortic Arches and the Arterial System 340 



3. The Venous System 343 



4. The Lymphatic System and Spleen 349 



V. THE CAVITIES OF THE BODY 350 



VI. THE LATER HISTORY OF THE MESODERMAL SOMITES . 352 



VII. THE URINOGENITAL SYSTEM 354 



1. The Excretory System 355 



A. The Pronephros and the Pronephric Duct (Wolffian 



Duct) 355 



B. The Mesonephros 356 



C. The Metanephros 358 



2. The Reproductive System ...... 359 



A. The Reproductive Ducts 360 



B. The Gonads 361 



3. The Adrenal Bodies .* . . 363 



IT remains now for us to describe the chief events. in the 

 development of the systems and organs of the embryo, from the 



301 



