OOETEX OF FOHBBEAIN AND MEDULLA OF HEMISPHERES. 



235 



association-fibers which arises in the cornu Ammonis and terminates at the 

 place where this is surrounded by the gyrus dentatus. 



The fibers must belong to the cortex itself, and not simply penetrate thither, 

 for in a dog in which a, single gyrus hippocampi only remained of the entire cerebral 

 cortex, this system was shown to be entirely preserved. 



Eig. 154. — Section through the base of the brain and the gyrus hippocampi 

 lying under it. (After a, preparation stained with hsematoxylin-copper-lake.) 

 The plexus chorioideus is drawn somewhat simpler than it is in the adult. Notice 

 that it separates the ventricle from the cavity of the skull, and the manner in 

 which it is done. Tangentialfasern, Tangential fibers. 



The lamina medullaris circumvoluta lies in the region of the long 

 dendrites, which the cells of the gyrus hippocampi give o£E. The directing 

 of so many long dendrites outward giyes to this stratum a slightly striated 



