660 Dynamic Theory. 



oc, fig. 366, marks the position, within, of the hippocampus minor in 

 the posterior cornu of the lateral ventricle. In the monkey, the cal- 

 carine fissure joins the hippocampal sulcus, but not in man. 



FIG. 366. 



FIG. 366. Mesial surface Eight Hemisphere of Human Brain. 

 CC. Corpus Callosum. 

 Gf. Gyras Fornicatus 



Gyrus Hippocampi. 

 h. Sulcus Hippocampi. 

 U. Uncinate gyrus. 



cm. Sulcus Calloso-marginalis. [volution. 

 Fl. Median aspect of the 1st Frontal Con- 

 C- Terminal portion of the fissure of Ro- 



A. Anterior Central Convolution. [ lando. 



B. Posterior 



02. Cuneus, or internal occipital lobule. 

 Pi. Precuneus. 



Calcarine fissure. 

 . Upper branch of oc. 

 . Lower branch of oc. 

 Descending gyrus. 

 : . Fusi form Lobule. 



Lingual Lobule. 

 Gf and H together constitute the Falciform 



Po. Parieto-occipital fissure. 

 O. Transverse occipital sulcus. 



Lobe of Broca, and they are the Centers 

 for Touch. 



h is also called the Dentate fissure. 

 U is also called Hippocampal Lobule, or 

 Subiculum Cornu Ammonis. It is the 

 Center for Smell, and near by, but not 

 well defined, is the Center for Taste. 

 f ( See figs. 270, 367.) 



The sensory tract of the internal capsule comprises its posterior one- 

 third or more. Lesions of this part in man or dog have the effect to 

 produce hemianaesthesia, or loss of tactile sensation and the muscular 

 sense, sensation of heat, pressure-, &c. ( See x fig. 349. ) The fibres from 

 the outer third of the foot of the crus cerebri diverge from the internal 

 capsule at the base and radiate outwards and downwards toward the hip- 

 pocampal region. Lesions of this region Ferrier found to impair tactile 

 sensation. The region includes the gyrus fornicatus, hippocampus, 

 hippocampal gyrus and the callosal gyrus. It includes in short the 

 whole of the falciform lobe, the callosal as well as the hippocampal di- 

 vision, all lying on or belonging to the mesial surfaces of the hemis- 

 pheres. The various centers of the cortex are connected anatomically 

 with definite peripheral organs of sensation and motion, and disorgani- 

 zation of any part of the complete line leads to atrophy of the rest. 



" The occipito angular region ( 13, 13' fig. 362 ) is the cortical expan- 

 sion of the optic tract in the same sense as the retina is its peripheral ex- 

 pansion, and the destruction of either expansion leads to atrophy of the 

 optic nerves. " (Ferrier.) The motor parts of the cortex are the cere- 



