108 LECTUEE IV. 



Upon these lateral central lobes, two convolutions always pro- 

 ceed from the point of the V upwards, extending to the longi- 

 tudinal fissure of the hemispheres, where they terminate about 

 the centre of the sagittal suture, that is to say, at the vertex. 

 These two convolutions form at their base the covering of the 



Fig. 32. Side view of the brain of tlie Hottentot- Venus. 

 R 



v:jl 



The following designations apply to this as well as to all following figiu-es 

 of the brain in these Lectures. F. Frontal lobe. P. Parietal lobe. O. Pos- 

 terior lobe. T. Temporal lobe. Po. Pons Varolii. C. CerebeUuiu. V. M. 

 MeduUa oblongata. 



S. Sylvian fissure. R. Fissure of Eolando. F. Vertical transverse fissui-e. 

 L. Longitudinal fissure. P. 8. Parallel fissui-e. 



A. Anterior central convolution. 



B. Posterior „ „ 



ai Upper fold of the convolutions of the frontal lobe. 

 a? Middle fold of the convolutions of the frontal lobe. 

 d* Lower fold of the convolutions of the frontal lobe, 

 fci Upper fold of the convolutions of the parietal lobe. 

 h- Middle fold of the convolutions of the parietal lobe. 

 Ifi Lower fold of the convolutions of the parietal lobe, 

 ci Upper fold of the convolutions of the temporal lobe. 

 c^ Middle fold of the convolutions of the temporal lobe, 

 c^ Lower fold of the convolutions of the temporal lobe. 

 (D- Upper fold of the convolutions of the posterior lobe. 

 dp- Middle fold of the convolutions of the posterior lobe, 

 cl^ Lower fold of the convolutions of the posterior lobe. 



