304 



THE BODY AT WORK 



enable us to form a conception, however crude, of the way in 

 which it works. From the brief account that has been given, 

 it will be evident that anatomists are approaching to an 

 understanding of the mechanism. It will also be evident 

 that they have already more information than they can apply. 

 They are cognizant of many details of structure which they 

 cannot interpret in terms of function ; and at the same time 

 are aware of wide gaps in their knowledge regarding facts 







WecuLar 

 layer 



FIQ. 21. THE GROWTH AND MIGRATION OP GRANULES OF THE CEREBELLUM. 



Half a dozen nuclei of as yet undeveloped granules are seen lying beneath the pia mater. 

 Prom this level to the bottom of the drawing granules are shown in successive stages of 

 growth. These developing granules, selected from various preparations of the cortex of 

 the cerebellum, were drawn from nature. 



which are essential to the construction of any scheme. This 

 much is clear : A sense-cell on the surface or beneath it is 

 touched (probably entered) by the ultimate twig of the outer 

 limb of a neurone whose cell-body lies in a spinal ganglion, 

 while its inner limb, as a fibre of a posterior root, enters the 

 spinal cord. In the spinal cord the root-fibre splits into an 

 ascending and a descending division which rain branches into 

 the grey matter over a considerable area above its point of 



