544 



THE ORGANS 



such as suppression, diminu- 

 tion, enlargement, or subdi- 

 vision of certain layers. The 

 cell layers of the cortex are: 

 (i) Molecular layer (zonal 

 layer, plexiform layer of 

 Cajal). This contains the 

 horizontal cells, other cells 

 with short axones, and also 

 receives the axones of the 

 Martinotti cells. Besides 

 this, it contains the terminal 

 branches of the apical den- 



II 



Fig. 363. 



Fig. 363. — Vertical section of 

 Calcarine Area of Cortex of an In- 

 fant 15-20 days old. (Cajal, com- 

 bined from three, /, // and ///, 

 somewhat overlapping figures. The 

 multiform layer is not included). 

 Golgi's method. 



/. — A, Molecular layer; B, ex- 

 ternal granular layer (of small pyra- 

 mids); C, pyramidal layer (of me- 

 dium pyramids); a, descending ax- 

 ones; b, ascending collaterals; c, 

 apical dendrites of large pyramidal 

 cells in ganglionic layer. 



//. — A , Sublayer of large stellate 

 cells; B, sublayer of small stellate 

 cells; C, outer part of ganghonic 

 layer; a, crescentic stellate cells; b, 

 and /, horizontal, spindle-shaped 

 stellate cells; c, medium-sized pyram- 

 idal cells; e, stellate cells with 

 arched axones; g, triangular stellate 

 cells with stout, arched collaterals; 

 //, pyramidal cells with arched axones. 



///. — A, Part of internal granu- 

 lar layer; B, sublayer of small pyram- 

 idal cells with arched ascending 

 axones; C, sublayer of large pyra- 

 mids; a, large pyramidal cell; b, 

 medium-sized pyramidal cell with 

 long descending axone; c, small pyr- 

 B "3) amidal cell with arched ascending 

 axone; d, pyramidal cell with axone 

 split into two arched ascending 

 branches; e, pyramidal cells whose 

 axone sends out various ascending 

 branches; f,g,h, stellate cells with as- 

 cending axones which branch in B 

 and in the sublayer of small stel- 

 late cells; i,j,k, pyramidal cells with 

 arched ascending axones which send 

 branches into the ganglionic layer. 



c 



O 



