2l8 



ELEMENTS OF MAMMALIAN ANATOMY 



The foruix lies ventral to the callosum (Figs. io6 and io8) and 

 consists of a median plate of fibers, the body, two posterior 

 columns or crura, and two anterior columns. The median plate 

 or body of the fornix sends some fibers into the ventral surface 



Fig. 107. — Dorsal Aspect of the Brain with the Cerebellum and the 

 Dorsal Third of the Cerebrum Removed and Most of the Corpus Callo- 

 sum Cut Away froxM the Right Half. 



ac. Right anterior corpus quadrigeminum ; c, commissure of the quadrigemina; 

 ca, the united superior and inferior peduncles of the cerebellum; cr, the middle 

 peduncle of the cerebellum; cs, corpus striatum; ct, edge of corpus callosum cut 

 slightly to the left of the median line; cal, dorsal surface of the callosum into 

 which a hole has been cut; hp, hippocampus in the median cornu of the lateral 

 ventricle; h, hippocampus near where it is joined by the fibers of the crus of 

 the fornix; i, uncut portion of the callosum; md, medulla oblongata; n, columns 

 of the fornix; o, gray cortex of the cerebrum; p, crus of the fornix; pn, pineal 

 body, craniad to which is the heavy white line, the commissure of the habenae 

 or teniae thalami; pp, funiculus gracilis; re, funiculus cuneatus lateralis of Rolando; 

 /, funiculus cuneatus; ts, posterior corpora quadrigemina; x, body of the fornix. 



of the callosum. From the cranial border of the body near the 

 median line the two anterior columns descend in a curve, 

 forming the cranial boundary of the third ventricle as far 

 ventrad as the anterior commissure. Here the two columns 

 diverge slightly from the median line, but continue their 

 descent, curving caudad to their termination in the corpora 



