BLOOD SUPPLY OF THE PITUITARY BODY 



143 





Fig. 3 Same region as in figs, land 2, after removal of dura and excision of the 

 arteries shown in fig. 2 whicli conceal the venous supply to the anterior lobe. 

 A crescentic segment of anterior lobe has been cut away in order to expose the 

 posterior lobe and bring into view the median vein M.v., which traverses the pars 

 posterior and enters the circular sinus. Great difference in vascuhxrity of two 

 lobes can be seen in gross. Numerous small veins radiate outward from the stalk 

 of the hypophysis to a circle of veins very similar to the arterial circle of 

 Willis. Relation to arteries shown by peripheral stubs of the excised trunks 

 fully shown in fig. 2. 



