36 



SOURCES OF KINETIC AND METABOLIC HORMONES 



|^>;vj Primary capillary net 

 ^^ Secondary capillary net 



Vascular plexus 

 Portal vessels 



Fig. 2-11. Pituitary body in diagrammatic sagittal section with its 

 circulation shown by thin arrows : a to d in fish, c to ^ in amphi- 

 bians and reptiles. A.H., adenohypophysis, divided into pars 

 distalis (P.D.), pars tuberalis (P.T.), and pars intermedia (P.I.) 

 in tetrapods; N.H., neurohypophysis, divided into median 

 eminence (M.E.) and neural lobe (N.L.) with separate circulation 



