VALVULA CEREBELLI 141 



of the nerve connections in the Megrim as well as the sole, plaice, 

 and other Hattish. If we examine sections of the lobus infundibuli, 

 we note that anteriorly beyond the attachment of the pituitary 

 body, fibres pass ventrally from either side of the infundibulum, 

 and miite to form a median bundle of nerve fibres ; a little fm-ther 

 caudally, a meshwork of fibres appears on the lateral margins of the 

 mescnc'ojihalon. and the median bundle becomes dumb-bell shaped. 

 Further back still the median bundle divides into two trunks which 

 move dorsally. The pituitary is here attached to the margins of 

 the infundibulum, and a ganglion appears on either side of the 

 attachment, from wliich fibres pass dorsally along the margin to 

 the meshwork before mentioned. Finally nerve fibres pass from 

 this meshwork to join the fibres of the nervus infundibuli, and the 

 combined trunk enters the ventral end of the nuclei rotundi. It 

 thus appears that the lobi inferiores are the co-ordinating centres, 

 not only for the olfactory and hypothalmic impulses but also for 

 the optic and gustatory nerves, and that the nuclei rotundi also 

 receive fibres from the infundibulum and from the lateral nuclei 

 at the attachment of the pituitary body. As we have already 

 seen fibres pass to these lobes from the valvula cerebelH, so that 

 there is every reason on anatomical grounds to consider the lobi 

 inferiores are an important organ for regulating the various messages 

 received from both sensory organs and hormone producing organs 

 as the pituitary body and possibly also the pineal gland. 



