326 



PHYSIOLOGY 



be divided, in consequence of the overlap of fibres at the periphery. In the 

 limbs the segmental distribution of the sensory fibres is made out with more 



FIG. 161. Transverse section of spinal cord, showing collaterals terminating in a 

 rich arborisation round the cells of Clarke's column (A, B), as well as others 

 passing to the anterior cornua, and through the commissures. (CAJAL.) 



difficulty. Each limb must be regarded as made up from a series of fused 

 segments, from five to seven in number. The accompanying diagram (Fig. 1 62) 



Teal- 



dor-sal, or ventral median. Hue- o 



Bead 



FIG. 162. 



from Sherrington shows the manner in which the skin fields of these segments 

 are combined to make up the total skin area in the hind limb of the monkey. 



