9 8 



THE CEREBRUM. 



being separated from the inferior temporal gyrus by an inter- 

 rupted sulcus near the infero-lateral border of the hemisphere. 

 The inferior temporal gyrus is chiefly on the convex surface. 



The paracentral lobule contains the motor center for the opposite 

 foot, just in front of the central sulcus; and immediately behind 

 that sulcus is the superior part of the receptive som&sthetic area 

 (Figs. 55 and 57). In the praecuneus is a part of the stereognostic 

 center; the remainder is in the superior parietal lobule; this center 

 belongs to the psychic-sensory area. The cuneus and lingual 

 gyrus, along the calcarine fissure of each hemisphere constitute the 

 receptive visual center for the corresponding halves of both retinae 

 and perhaps for both maculae luteae. Probably the anterior part 

 of the fusiform gyrus, that part just below the uncus, contains the 

 center of taste (Mills). 



The peripheral ring of gyri seen on this surface belongs to lobes 

 which have their largest exposure on the convex surface of the 

 cerebral hemisphere. Thus seven lobes belong to the exterior 

 surface of each hemisphere. 



Cerebral Hemisphere 



1. Seven lobes 



Frontal . 



Parietal 



Temporal 



Occipital 



Island (of Reil) 



Limbic 



Olfactory, etc. 



2. Basal ganglion 



I. Neopallium 



II. Rhinencephalon 



(archipallium) 

 III. Corpus striatum. 



INTERIOR SURFACE OF THE FORE-BRAIN. 



The boundaries of the fore-brain ventricles constitute the 

 interior surface. Considering these cavities together, we notice 

 that they occupy a wedge-like space (Figs. 30 and 42). In shape 

 the wedge is rectangular; and it stands, base upward, against the 

 corpus callosum. Its beveled surfaces look toward the hem- 

 ispheres. The blade is driven downward as if to split the fore- 

 brain into lateral halves, the edge resting on the medial structures 

 at the base of the brain. The space is inclosed laterally between 



