Thompson, Cells in the Cerebral Coftex of Man. 137 



REGION 11, 



REGION 13- 



REGION 16. 



REGION 10. 



Lay- 

 ers 



I 



2 



3 

 4 



5 

 6 



T^t. 



Lay- 

 ers 



thickness 

 of layer 



i.S mm. 



cells in 

 (0.1mm.)3 



(5) 



10 



(62) 

 20 



cells in 



unit 



column 



5 

 60 



372 

 loo 



537 



REGION 12. 



I 



2 

 3 

 4 

 5 

 6 



T^t. 



thickness 

 of layer 



•7 

 .2 



•4 

 1.2 



2.7 mm. 



cells in 

 (0.1 mm.)3 



(5) 



20 



45 



(12) 



17-5 



cells in 



unit 



column 



10 



140 

 90 

 48 



210 



498 



REGION 15. 



* l.p. — Large pyramids. 



tWherever two layers are joined 

 by a bracket, it indicates that 

 the two are not distinguishable as 

 separate layers, but are fused and 

 are represented by a single set of 

 measurements. 



X Layers 2 and 3 of region 8 are given by Hammarberg as measuring to- 

 gether only 0.2 mm. This number is so unprecedently small for these layers 

 and adopting it reduces the thickness of the cortex in region S so much below 

 all the other determinations for the thickness of the parietal cortex, that it has 

 been assumed that 0.2 mm. is a misprint and 1.2 mm. was substituted for it. 



J The layer measures 0.7 mm. but only 0.2 mm. of it contains cells. 



