47 6 



THE BRAIN 



temporal lobe is mapped out into three tiers of horizontal 

 gyri, which are termed the superior, inferior, and middle 

 temporal gyri (Fig. 1 8 6 ). 



Tentorial Surface of the Temporal Lobe. On this surface 

 there is one fissure, termed the inferior temporal sulcus. 



The inferior temporal sulcus (Fig. 188) lies below and lateral 



S.R./. 



FIG. 190. Fissun 



nd Gyri on the Surface of the Insula. 

 (Eberstaller.) 



i, 2, and 3. Three short gyri on the frontal 



part of the insula. 



4 and 5. Two long gyri on parietal part. 

 S. R.a. Anterior part of limiting sulcus. 

 S.R.J. Superior part of limiting sulcus. 

 S.R./. Inferior part of limiting sulcus. 

 L. Limen insulae. 

 P. Pole of the insula. 



F. Orbital operculum (for the most part 



removed). 

 T. Temporal pole. 

 Ti. Superior temporal gyrus. 

 T2. Middle temporal gyrus. 

 x.y. Gyri of Heschl. 

 s.i, Sulcus centralis insulae. 

 s.a. Sulcus praecentralis insular. 

 m. Gyri on deep surface of temporal pole. 



to the collateral fissure, and close to the infero-lateral border 

 of the hemisphere. It runs in an antero-posterior direction 

 and is not always confined to the temporal lobe, but may 

 extend posteriorly towards the occipital pole. It is usually 

 broken up into two or more separate pieces. 



The fusiform gyrus (Fig. 188) is situated between the 

 collateral fissure and the inferior temporal sulcus. It extends 

 from the occipital pole to the temporal pole. 



The narrow strip of surface below and lateral to the 



