418 THE PINEAL ORGAN 



however, agreed that in the human subject some of its fibres arise in the 

 nucleus interstitialis or nucleus of origin of the median longitudinal 



w 



N.C 

 fCh.Pi 1 



F. 1 

 V.M.C! 



S. — - 

 V.M.C. 2 





Th. 

 B. 



Fig. 281. — Pineal Region Viewed from Above. 

 The upper part of the right hemisphere of the brain has been removed and 

 the right lateral ventricle opened by removal of portions of the corpus callosum 

 and the roof of the posterior and inferior cornua. A part of the fornix and tela 

 choroidea were then cut away so as to expose the pineal body, habenular region, 

 and superior colliculus. The pineal body of the adult lies between 5 and 6 cm. 

 directly below the supero-medial border of the hemisphere, and its apex is 1 cm. 

 in front of the posterior end of the splenium of the corpus callosum. The great 

 cerebral vein lies in the velum interpositum (T. Ch.) between the pineal body 

 below and the fornix and corpus callosum above. 

 C. : cerebellum. O. Th. : optic thalamus. 



Ch. PI 1 and 2 : choroid plexus. P.B. : pineal body. 



C.S. : colliculus superior. 5. : splenium of corpus callosum. 



F. 1 and 2 : fornix. V.B. : vena basilaris. 



N.C. : nucleus caudatus. V.M.C. 1 and - : vena magna cerebralis. 



(Original : R. J. G.) 



fasciculus, and that the decussating fibres have connections through this 

 tract with the nuclei and nerve-fibres of the eye muscles. The com- 



