68 



HYPOPHYSIS->-OVARY->- OVIPOSITOR 



II 



originate, and through which pass other tracts, coming from 

 the nucleus praeopticus. Here, presumably, is the sexual centre 

 we were seeking; or, at any rate, a nucleus which, together 

 with the nucleus lateralis tuberis, is in direct connexion with 

 the hypophysis. 



d, Intrahypophysial nerves. 



Within the pituitary the nerve fibres lose themselves in the 

 numerous branches of the lobus posterior, becoming embedd- 

 ed in the glia. They either run straight, bend, or turn back 

 in a loop, and emerge from the lobus posterior in a winding 

 course, forming a network around the glandular cell islands 

 (Fig. 55). The local widenings and small loops may be 

 places of contact with the gland-cells. The strongest inner- 

 vation is that of the lobus anterior; the poorest, of the lobus 

 tuberalis. Upon impregnation with silver, pituicytes appear 

 in the lobus intermedius, with short, impregnated offshoots 



lobus ant 



acidopfiii island 

 Fig. 55. Intrahypophysial nerves in Rhodeus amarus. 



