1895.] to the Fascia Dentata and to the Nerves of Lancisi. 101 



Fig. C is a photograph of a brain in which the fasciola cinerea is 

 well-developed. The dentations of the fascia dentata as it lies in the 

 dentary fossa are unusually well marked. As the fimbria leaves it 



Fia. C. 



Photograph of a Portion of the Brain of a Man 45 years old. The Brain had been 

 hardened in bichromate of ammonia. Magn. f . 



A. G-yrus fornicatuB joining 



B. Gyrus lingualis. 



C. Corpus callosum. 



D. Posterior pillar of the fornix. The fascia dentata is seen passing out of the 



groove between the fimbria and the gyrus hippocampi ; it divides after 

 a short distance into 



E. Callosal convolution and 



F. Fasciola cinerea, which ascends around the back of the splenium corporis 



callosi. 



to pass on the ventral side of the corpus callosum, the fascia dentata 

 (fasciola cinerea) ascends on the posterior surface of the splenium, at 

 first as a band of some breadth (fig. D), which divides, after a course 

 of about 4 mm., into two parts (fig. E), of which the outer is a small 

 oval convolution (callosal con volution), and the inner the continuation 

 of the fascia dentata. The cortex from the gyrus fornicatus is con- 

 tinued into the callosal convolution, in which it is closely folded like 

 a capital Q before it enters the fasciola cinerea. In the fasciola 

 cinerea it lies at first flat on the corpus callosnm, and then folds 

 back on itself, to receive its cap of stratum granulosum, which 

 borders the groove that separates it from the callosal convolu- 

 tion. Traces of a cap of fascia dentata can be seen for about 2 mm. 

 beyond the separation of the gyrus callosalis and the fasciola. For 



