AUTHOR S ABSTRACT OF THIS PAPER ISSUED BY 

 THE BIBLIOGRAPHIC SERVICE, SEPTEMBER 29 



THE HYPOPHYSIS CEREBRI OF THE CALIFORNIA 



GROUND-SQUIRREL, CITELLUS BEECHYI 



(RICHARDSON) 



HAROLD J. COOPER 



Division of Anatomy, Stanford University Medical School 



ELEVEN FIGURES 



CONTENTS 



Introduction 185 



Material and methods 189 



Gross features '. 190 



Microscopic features 192 



Pars buccalis ; . . . . 193 



Pars distalis 193 



Pars juxta-neuralis 198 



Pars infundibularis 198 



Pars tuberalis 200 



Pars neuralis 200 



Colloid 201 



Summary 203 



Bibliography 203 



Despite the prevailing interest in the structure and functions 

 of the hypophysis, but little attention has been paid to the ro- 

 dents, and none to the common ground-squirrel, so far as I have 

 been able to ascertain. Stendell ('14) gives a brief account of 

 the more salient features of the rodent hypophysis. Mann ('16), 

 working on the ductless glands of the spermophile and their 

 possible relation to hibernation, briefly describes the changes 

 which the hypophysis undergoes during these periods. The 

 more detailed studies have seemingly been carried out on man 

 and the higher mammals. 



Using the terminology of Tilney ('11) and ('13), the adult 

 mammalian hypophysis is generally recognized to-day as being 

 made up of a buccal and neural portion whose subdivisions may 

 be tabulated as follows: 



185 



