154 



H( 



disappeared, so that there is never a direct continuity between the neural 

 canal and the exterior. The observations, nevertheless, give support ta 

 Kupft'er's views on the morphological significance of the pituitary. 



Vascular Supply of the Pituitary Body. 



The arrangement of the blood-vessels in the pituitary body has already 

 been described along with the structure of its several parts, but a general 



Fi<;. 16. — Mesial sagittal section of pituit<iiy body of adult cat ; blood-vessels 

 injected witli carmine gelatine. (Photograph.) 



a, ojitic cliiasnia ; 6, tongue-like process of pars intermedia; c. third ventricle; d, anterior lobe; e, pars 

 intermedia lying above neck of posterior lobe; /, posterior lobe ; <;, central artery entering posterior 

 lobe at its postero-superior angle ; h, large vein lying between nervous substance and epithelial invest- 

 ment of posterior lobe. 



survey of the vascular distribution in the cat s pituitary may be given.. 

 The most noticeable feature of the injected organ is the difference in vascu- 

 larity of the two lobes. The anterior lobe is filled with wide channels, making 

 it one of the most vascular structures of the body ; the posterior lobe, on 

 the other hand, resembles in the number and arrangement of its vessels the 

 adjacent white matter of the brain. A large blood sinus is found on either 

 side of the pituitary body below. The anterior lobe is supplied by arteries,, 

 apparently from the internal carotid, which enter it at the sides of the 

 infundibulum above, and break up immediately into large, thin-walled' 



