THE NERVOUS SYSTEM. M$ 



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 albi- 

 cantia. The posterior columns, or crura, descend from the 

 caudal border of the body, curving laterad into the median 

 cornu of the lateral ventricle, and gradually unite with the 

 cornu ammonis. The cornu ammonis, or hippocampus 

 major, is a thickened projecting fold of the wall of the 



FIG. 96. DORSAL ASPECT OF THE BRAIN WITH THE CEREBELLUM AND 

 THE DORSAL THIRD OF THE CEREBRUM REMOVED AND MOST OF THE 

 CORPUS CALLOSUM CUT AWAY FROM THE RIGHT HALF. 



ac, Right anterior corpus quadrigeminum ; c, commissure of the quadri- 

 gemina; ca, the united superior and inferior peduncles of the cere- 

 bellum ; cr, the middle peduncle of the cerebellum ; cs, corpus 

 st'riatum; 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 major, or cornu ammonis, in 

 the median cornu of the lateral ventricle ; h, hippocampus major 

 near where it is joined by the fibers of the crus of the fornix; i, 

 uncut portion of the callosum; md, medulla oblongata; n, anterior 

 columns or pillars of the fornix; o, gray cortex of the cerebrum; 

 p, posterior crus of the fornix; pn, pineal gland, craniad to which 

 is the heavy white line, the commissure of the habenae or taenise 

 thalami; pp, funiculus gracilis; re, funiculus of Rolando; /, funic- 

 ulus cuneatus ; ts, posterior corpora quadrigemina ; x, body of 

 the fornix. 



