THE CERES RUM. 699 



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

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

 tion, or forceps major. 



There is nothing to note concerning the fornfx and septum lucidum, except that there 

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

 aperture, the vulva. 



The lateral ventricles offer remarkable differences. 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 



THE BASE OF THE HUMAX 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 cinereum ; 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 molliss 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 cornu Ammonis is slightly bosselated on its 

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

 lamina, the gyrus fornicat us. 



The other portions of the human brain resemble those of animals ; so that it is 

 needless to allude to them. 



