138 



HUMAN PHYSIOLOGY. 



The Inferior frontal convolution winds around the ascending branch of 

 the fissure of Sylvius, in the anterior and inferior portion of the cerebrum. 



Parietal Lobe. The Ascending parietal convolution is situated just 

 behind the fissure of Rolando, running downward and forward; above, it 

 becomes continuous with the upper parietal convolution, and below, winds 

 around to be united with the ascending frontal. 



FIG. 14. 



DIAGRAM SHOWING FISSURES AND CONVOLUTIONS OF THE LEFT SIDE OF THE HUMAN 



BRAIN. 



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, superior ; F 2 , middle, 

 and F 3 , inferior frontal convolutions ; f 1; superior, f 2 , inferior, frontal fissures ; 

 fg. sulcus praecentralis ; P, superior parietal lobule ; P 2 , inferior parietal lobule, con- 

 sisting of p2, supra-marginal gyrus, and P' 2 , angular gyrus ; z"/, sulcus interparietalis ; 

 c m, termination of calloso-marginal fissure; Oj, first, O 2 , second, O 3 , third, occipital 

 convolutions ; p <?, parieto-occipital fissure ; o, transverse occipital fissure ; /?<>, inferior 

 longitudinal occipital fissure; Tj, first, T 2 , second, T 3 , temporo-sphenoidal, convolu- 

 tions,^, first, / 3 , second, temporo-sphenoidal fissures. Landois' Physiology. 



