726 



A TEXTBOOK OF PHYSIOLOGY 



The middle cell lamina is next developed, and is believed to be 

 concerned in the reception of sensory stimuli. It is most marked in 

 the sensory regions of the cortex. In man, it develops in the sixth 

 month of foetal life. 



v ...... f ,i'. t ,; 



^*Vv' "V'.^'V-. 



"-v>S.' ? .' v .i/\- 



FIG. 443. FIBRE ARRANGEMENT AND CELL LAMINATION OF VISUAL AREA. (Mott.) 



Last to be developed is the outer cell lamina. It is suggested that 

 this is concerned in pyschic processes, and is particularly marked in 

 regions concerned in these processes, especially in the frontal area 

 of the brain. 



