THE DEVELOPMENT OF THE HYPOPHYSIS IN 



REPTILES 



E. A. BAUMGARTNER 



Department of Anatomy, Washington University Medical School, St. Louis 



SIXTY -EIGHT FIGURES 



CONTENTS 



J . Introduction 209 



II. Literature 211 



1. Embryology 211 



2. Anatomy and histology 216 



III. Morphogenesis of the hypophysis 221 



1. Development in turtles 221 



2. Development in lizards 230 



3. Development in alligators 234 



4. Development in snakes 239 



5. Discussion 243 



IV. Histology of the hypophysis 255 



1. Turtles 256 



2. Lizards 257 



3. Snakes ! ... 259 



4. Alligators 259 



5. Discussion 262 



6. Secretion 264 



7. Nerve supply 265 



V. Histogenesis of the hypophysis 267 



VI. Conclusions 271 



VII. Literature cited 273 



INTRODUCTION 



The hypophysis, like all other internal secreting organs, is 

 receiving considerable attention from investigators in the fields 

 of physiology and comparative anatomy. The importance of 

 these organs to the animal economy can be more fully compre- 

 hended when their histological and morphological structure and 

 development are more clearly understood. This paper is an 

 attempt to describe the development in certain species of the 

 various classes of reptiles and to answer some of the questions 

 concerning such development and structure which still remain 

 undecided. Woerdemann ('14) believes that a comparison and 



209 



JOURNAL OF MORPHOLOGY, VOL. 28, NO. 1 



