706 



E. V. COWDKY 



meters broad, and one-half to one centimeter thick. During pregnancy it in- 

 creases greatly in size, chiefly in the vertical and lateral diameters. 



Relations The general relations of the hypophysis to the stnic- 



A. eonuwancans 



anterior. 



Sinus intercavernosus 



Position of canalis 

 rranio pluiryiigous 



Pharyngeal hypophysis 



Margin of nasal scptum_ 



Infundibulura 

 Diaphragma Sellae 



inus intercavernosus 

 posterior 

 Pars anterior 

 Pars intermedia 

 Pars posterior 



Roof of pharynx 

 tachian tube 



Fig. 1. Diagram showing the relations of the human hypophysis in median sagittal 

 section. Dura, blue; arachnoid, yellow; and pia, red. 



I Ventricle 



tic chiasma 

 A. coinmunicans posterior 



iaphragma sllae 

 Pars anterior 

 Pars intermedia 



s posterior 

 A. oarotis interna 

 Sinus cavemosns 



Sphenoid bone 

 Pharynx 



Fig. 2. Diagram of a transverse section of the human hypophysis. Dura, blue; 

 arachnoid, yellow; and pia, red. 



tures at the base of the skull are illustrated in Figs. 1 and 2. It is 

 attached above to the hypothalamus by the infundibular stalk and is 

 lodged in the sella turcica of the sphenoid bone. The chief variations in 

 the shape of the sella turcica, and their importance from an operative 

 standpoint are considered by Lewis. It will be seen from the diagrams 



