THE CEBEBBUM. 



699 



The corpus callosum is veiy developed, and, above the ventricle, forms, from before to 

 behind, a salient angular prolongation named the frontal comu and occipital prolonga- 

 tion, or forceps major. 



There is nothing to note concerning the fornix and septum hicidum, except that there 

 is a ventricle in the latter which oummunicates with the middle ventricle by a small 

 aperture, the vulva. 



The lateral ventricles offer remarkable diiferences. They are not prolonged into the 

 olfactory lobes, but possess a diverticulum that enters the occipital lobe, below the 

 forceps major. This space is more or less developed, and terminates in a point ; it is 

 named the ancyroid or digital cavity, and shows on its floor a small convolution which 



Fig. 333. 



THE BASE OF THE HUjVIAN BRAIN. 



1 Longitudinal fissure; 2, Anterior lobes of cerebrum; 3, Olfactory bulb; 4, 

 Lamina cinerea ; 5, Fissure of Sylvius ; 6, Locus perforatus anticus ; 7, Optic 

 commissure; 8, Tuber cinei-eum; 9, Third nerve; 10, Corpus albicantium ; 11, 

 Fourth nerve ; 12, Locus perforatus posticus ; 13, Fifth nerve ; 14, Crus cerebri ; 

 15 Sixth nerve ■ 16, Pons Varolii ; 17, Portio dura of seventh nerve ; 18, Middle 

 lobe of cerebrum • 19, Portio moUiss of seventh nerve ; 20, Anterior pyramid ; 

 21, Glosso-pharyngeal nerve ; 22, Olivary body ; 23, Pneumogastric nerve ; 24, 

 Lateral tract; 25, Spinal accessory nerve; 26, Digastric lobe; 27, Hypo- 

 glossal nerve; 28, Cerebellum; 29, Amygdala; 30, Slender lobe; 32, Posterior 

 inferior lobe- 



has been designated the ergot of Morand {pes hippocampi). _ The diverticulum and con- 

 volution do not exist in animals. The comu Ammoms is slightly bosselated on its 

 surface; it is limited, inwardly, by a band, and below this by a grey denticulated 

 lamma^ t^^e^^^res /ormra MS^^^ human brain resemble those of animals; so that it is 

 needless to allude to them. 



