THE STRUCTURE OF THE SPINAL CORD. 

 FIG. 121. 



537 



Rr' 



Rr. 



CT 



C.P.T 



Transverse Dorso-ventral Section of Spinal Cord (Human) at the Level of the Sixth Cervical 

 Nerve. (Sherrington.) This is drawn on the same scale as Fig. 119, that is, magnified fifteen times 

 r.f . L, lateral reticular formation ; r.f. p., posterior reticular formation; p', fine fibres of lateral 

 bundle of the posterior root ; p", p'", fibres of median bundle of posterior root entering gray matter 

 from external posterior column ; x, gray matter of posterior horn ; Sp. a., bundles of fibres belong- 

 ing to the spinal accessory nerve : in the lateral reticular formation they are seen cut transversely ; 

 b, is the natural septum of connective tissue marking out the cerebellar tract C. T. from the crossed 

 pyramidal tract C. P. T. ; z. s., zona spongiosa ; 2 . , /3, y, lateral cells of the anterior horn ; 5, cells 

 in the region of the lateral reticular formation. The other letters of reference are the same as in 

 Fig. 119. 



