CORRELATING CENTERS IN THE DIENCEPHALON. 



279 



An additional evidence in favor of this vievv^ is seen in the rela- 

 tion of the nucleus habenulae to the ventricle and the membranous 

 roof. The nucleus habenulae in fishes (Fig. 140) is a lobe pro- 



Corn m. sup. 



Plex. chorioid. 



•Corp. genie. 

 lat. 



Tr. opt. 

 med. bdl. 



Tr. opt lat bdl. 



Tr. spin 



L. \isc. 



Sec, gust, tract 



Fig. 141. — Transverse sections through the brain of Ajnia at the level of the 

 nucleus habenulae and of the facial lobe. Comm. sup. indicates the position in 

 which the habenular commissure appears in the next adjacent section. The draw- 

 ings were made from Golgi sections with the aid of the camera. 



jecting into the ventricle, its cells either border upon the ventricle 

 or are arranged in rows parallel with the ventricular surface, and 

 the membranous roof passes beyond the nucleus habenulae and is 



