GROWTH OF THE CEREBRAL CORTEX 



547 



Area h'. 



I 



IIIA. = narrow; large Pyr. 

 IIIB. = broad; small Pyr. 

 IV. = narrow; poor in cells. 

 V. = narrow; few Pyr., indis- 

 tinct. 

 VI. many cells. 

 Area j . 



I 



III. = 2 X IV; Pyr. 



IV. clouded. 

 V. Pyr. 



VI. Similar to VI of area f, di- 

 vided into two sublayers. 

 Area k. 



I 



III. Pyr. 



IV. = narrower than III; less 



granules than in area j. 

 V. = III + IV; small typical 



Pyr. 

 VI. = narrow. 

 Claustrum. 

 Area k". 



I 



III. = narrower than III in area 



k. 



IV. very few cells, light band. 

 V. = narrower than V in area k. 



VI. = narrower than VI in area k. 

 Claustrum. 

 Area 1. (compactly constructed, sit- 

 uated at bottom of the fis- 

 sura rhinalis near h'; not 

 shown in figure 11). 



I 



IV 



V. = narrow. 

 VI. = narrow. 

 Area m'. (radiating). 

 I 



III. = rather narrow; Pyr. 



IV. = narrow; poor in cells. 



V. = broad; Pyr; rather poor in 



cells. 

 VI. very small cells. 



Area n. 



I 



Ill 



IV. granular density great. 

 V. many largest Pyr. 



VI 



Area o. (free from cortex). 

 Area p. 



I 



Ill 



IV. = narrow; few cells. 

 V. Pyr. 

 VI. nor divided by a light band, 

 but close to the white sub- 

 stance a narrow layer of 

 spindle-shaped cells. 

 Area r. (fascia den tata). 



I 



IV. = narrow; cells crowded to- 

 gether, beneath IV some 

 scattered cells. 

 Area s. (cornu Ammonis). 



I 



V. Pyr. dispersed. 

 Area w. 



I 



III. typical Pyr. 



IV. rich in cells, distinct. 

 V. small typical Pyr. 



VI 



Area x. 



I 



IIIA. Pyr. 



IIIB. = I X IIIA; Pyr. 

 IV. no cells, light band. 



VI 



Area z. (agranular, light bands be- 

 tween III and V, and also 

 between V and VI) . 



I 



111. typical Pyr. 

 V. Pyr. 



VI 



Area z". 



I 



IV 



V. = IV; Pyr. 

 VI. = narrow. 



