G96 



FUNCTIONS OF THE CEREBRUM 



[CH. XLYIII. 



They are 10 in number, and are those provided with myelinated fibres at birth ; 

 they contain the seats of the cortical representation of all the senses. To No. 1 is 

 assigned the cutaneous and muscular sense ; to No. 2 the sense of smell ; to No. 4 

 that of vision ; to No. 5 that of hearing. The functions of some of the primary 

 areas had not been determined. The principal efferent projection tracts originate 

 from the primary fields; thus the pyramidal tract starts from No. 1, but mainly 



FIG. 506. Outer surface of human brain, showing Flechsig's developmental zones; primary (1 10) 

 darkly shaded ; intermediate (1131), less deeply shaded ; terminal (3236), not shaded. (Flechsig.) 



from the ascending frontal convolution.* The sensory fibres connected with the 

 skin and muscles terminate mainly in the ascending parietal convolution. The 



FIG. 507. Inner surface of same. (Flechsig.) 



inferior fornix is connected with Nos. 2 and 3. The inner bundle of the pes springs 

 from 1 b, 6, 12, 14 and 15 ; the origin of the outer bundle of the pes is doubtful. 

 From the visual area (No. 4) a tract arises which passes mainly into the anterior 

 corpus quadrigeminum ; the auditory zone (No. 5), towards which a tract proceeds 



* This coincides well with the work of Sherrington and Grunbaum (p. 686). 



