Anatomy, Embryology, Compara- 

 tive Anatomy and Histology of 

 the Hypophysis Cerebri 



E. V. COWDEY 



NEW YORK 



Anatomy 



The word "hypophysis" is derived from the Greek, M, under, and 

 (pveuv, to grow, and is very appropriate from the standpoint of develop- 

 ment. The older term "pituitary," on the contrary, comes from the 

 Latin, pituita, clammy moisture, and was originally used to indicate the 

 belief that the gland poured out a mucous secretion into the nasal cavity. 

 The name is variously employed with reference to the whole organ and 

 the anterior lobe only. 



Terminology. The following terminology will be used in this ac^ 

 count : 



Hypophysis pharyngei 



Canalis craniopharyngeus 

 Hypophysis cerebri 



(a) Lobus anterior 

 Pars anterior propria 

 Pars intermedia 

 Pars tuberalis 



(b) Lobus posterior 

 Infundibulum 

 Pars nervosa 



Parahypophysis 



Gross Morphology and Relations. The hypophysis is a small body 

 weighing in adult males and nulliparaa about sixty-five centigrams. It is 

 oval in shape, being about one centimeter long, one to one and a half centi- 



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