NEUROLOGY 





The superior surface forms the lower limit of the lateral fissure and overlaps 

 the insula. On opening out the lateral fissure, three or four gyri will be seen spring- 

 ing from the depth of the hinder end of the fissure, and running obliquely forward 

 and outward on the posterior part of the upper surface of the superior temporal 

 gyms; these are named the transverse temporal gyri (Heschl) (Fig. 730). 



The lateral surface (Fig. 726) is bounded above by the posterior ramus of. the 

 lateral fissure, and by the imaginary line continued backward from it; below, 

 it is limited by the infero-lateral border of the hemisphere. It is divided into 

 superior, middle, and inferior gyri by the superior and middle temporal sulci. 

 The superior temporal sulcus runs from before backward across the temporal lobe, 

 some little distance below, but parallel with, the posterior ramus of the lateral 

 fissure; and hence it is often termed the parallel sulcus. The middle temporal sulcus 

 takes the same direction as the superior, but is situated at a lower level, and is 

 usually subdivided into two or more parts. The superior temporal gyrus lies between 



Clauslrum 

 Insula 



Transverse temporal gyri 



Optic tract 



Lentiform nucleus 

 Internal capsule 



TTwlamus 



Fimbria 



Tail of caudate nucleus 



Inferior cornu of lateral 



ventricle 



FIG. 730. Section of brain showing upper surface of temporal lobe. 



the posterior ramus of the lateral fissure and the superior temporal sulcus, and is 

 continuous behind with the supramarginal and angular gyri. The middle temporal 

 gyms is placed between the superior and middle temporal sulci, and is joined pos- 

 teriorly with the angular gyrus. The inferior temporal gyrus is placed below the 

 middle temporal sulcus, and is connected behind with the inferior occipital gyrus; 

 it also extends around the infero-lateral border on to the inferior surface of the 

 temporal lobe, where it is limited by the inferior sulcus. 



The inferior surface is concave, and is continuous posteriorly with the tentorial 

 surface of the occipital lobe. It is traversed by the inferior temporal sulcus, which 

 extends from near the occipital pole behind, to within a short distance of the tem- 

 poral pole in front, but is frequently subdivided by bridging gyri. Lateral to this 

 fissure is the narrow tentorial part of the inferior temporal gyrus, and medial to 

 it the fusiform gyrus, which extends from the occipital to the temporal pole; this 

 gyrus is limited medially by the collateral fissure, which separates it from the 

 lingual gyrus behind and from the hippocampal gyrus in front. 



