868 



THE NERVE-CELLS OF THE CORD. [BOOK m. 



is found in that part of the horn where, a little ventral to the 

 substance of Rolando, the uniform field of grey matter is broken 

 up into a kind of network by a number of bundles of white fibres 

 running in various directions. This network has also been called a 



,,- m.t 



J 



FIG. 99. TEANSVEBSE DOBSOVENTBAL SECTION OF THE SPINAL COBD (HUMAN) 



AT THE LEVEL OF THE THIBD LUMBAB NEBVE. (Sherrington.) 

 This is drawn to the same scale as Figs. 96, 97 and in the same way except 

 that the outline of the grey matter is not exaggerated. Pr'. median, Pr. inter- 

 mediate, Pr". lateral bundles of posterior roots. The region comprised under m.t. 

 is the marginal zone or Lissauer's zone. The other letters of reference are the 

 same as in 96 and 98. 



The three figures 96, 98, 99 are intended to illustrate the main differential 

 features of the thoracic, cervical, and lumbar cord. 



