THE NEOPALLIUM. 



347 



of the area is indicated in the accompanying Figures 175 and 176. 

 This area receives fibers from the chief sensory nucleus of the 

 thalamus and perhaps from other centers' of the general cutaneous 

 apparatus (cf. p. 259). With respect to the time of myelinization 

 these fibers are divided into three groups. The fibers of the first 

 group receive their myelin at the beginning of the ninth month of 

 foetal life and are the first fibers entering the neopallium to become 

 myelinated. Part of the fibers of the olfactory tract are mye- 

 linated somewhat earlier. The fibers which are first myelinated 





Fig. 176. The primordial areas in the cerebral hemispheres, mesial surface. 

 From Flechsig. See Fig. 175. 



carry impulses from the limbs and this accords with the evident 

 importance in the early life of the infant of the tactile impressions 

 received through the limbs. The fibers carrying impulses from 

 the trunk and head are myelinated later. 



2. The visual area. This occupies a small part of the lateral 

 surface and a large part of the mesial surface in the occipital 

 region. The fibers from the optic centers in the thalamus (p. 261) 

 receive their myelin just later than the greater part of the fibers of 



