THE CEREBRUM 



261 



posterior central convolution, above, this is continuous with the 

 upper parietal convolution, below which is the inferior parietal 

 lobule separated from the preceding by the intra-parietal sulcus. 

 This inferior parietal lobule winds around the posterior part of 



FIG. 81. Left side of the human brain (diagrammatic). 



F, frontal; P, parietal; O, occipital; T, temporo-sphenoidal lobe; S, fissure of 

 Sylvius; S', horizontal; S", ascending ramus of S; c, sulcus centralis, or fissure of 

 Rolando; A, ascending frontal, and B, ascending parietal convolution; Fi, suoerior, 

 F2, middle, and Fs, inferior frontal convolutions;/!, suoerior, and/2, inferior, frontal 

 fissures;/?, sulcus precentralis ; P, superior parietal lobule; P2, inferior parietal lobule- 

 consisting of P2, supra-marginal gyrus, and P2', angular gyrus; ip, sulcus interpariet' 

 alis; cm, termination of calloso-marginal fissure; O, first; Os, second; Os, third 

 occipital convolutions; po, parietal-occipital fissure; o, transverse occipital fissure; 

 02, inferior longitudinal occipital fissure; Ti, first; T2, sec9nd; Ta, third, temporo- 

 sphenoidal convolutions; ti, first; tz, second, temporo-sphenoidal fissures. (Landois.) 



