Wf^^ 



Fig. 7. To illustrate the anatomical extent of the median eminence as seen on the base of 

 the rabbit brain, (a) Base of brain of normal rabbit; (b) base of brain of rabbit hypophy- 

 sectomized 6 hr before death. Hypophysectomy severs the hypophysial portal vessels. 

 The primary plexus of these vessels in the median eminence therefore undergoes retrograde 

 thrombosis and the median eminence may then be clearly seen as a hardened, plum-colored 

 nodule. Anterior to the median eminence is the optic chiasma, and posterior is the 

 mammillary body, the posterior perforated substance and the emergence of the oculomotor 

 nerves from the midbrain. Scale in mm. 



