CHAP, i.] 



THE SPINAL CORD. 



857 



P.r. 



FIG. 96. A TBANSVEKSB DOKSO VENTRAL SECTION OF THE SPINAL COED (HUMAN) 



AT THE LEVEL or THE SIXTH THORACIC (DORSAL) NERVE. (Sherrington) 1 . 

 Magnified 15 times. One lateral half only is shewn. The large conspicuous 



nerve-cells (drawn from actual specimens) are shaded black to render their relative 



size, shape and position more obvious ; the outline of the grey matter has been 



made thick and dark in order to render it 'conspicuous. 



A.F. anterior fissure. P.F. posterior fissure, c.c. central canal, c.g.s. central 

 gelatinous substance. A.r. anterior root, P.r. lateral (or intermediate) bundle, 

 P.r'. median bundle of posterior root of spinal nerve, p', p" fibres of posterior 

 root passing p', indirectly through the substance of Rolando, p", directly into 

 grey matter, a.g.c. anterior grey commissure, p-g.c. posterior grey com- 

 missure, a.c. anterior white commissure, ant. col. anterior column, lat. col. 

 lateral column, post. col. posterior column, s.g. the substance of Rolando. 

 s. septum marking out the external posterior column or column of Burdach, 

 e.p., from the median posterior column or column of Goll, m.p. 



1. cells of the anterior horn. 3. posterior vesicular column or vesicular cylinder, 

 or column of Clarke; the area of the cylinder is defined by a dotted line. 4. cells 

 of the intermedio-lateral tract or lateral horn. 6. cells of the posterior horn. 

 7. cells of the anterior cervix, y. a tract of fibres passing from the vesicular 

 cylinder to the lateral column. 



1 For this and many succeeding figures I am deeply indebted to my friend and 

 former pupil Dr Sherrington who has kindly prepared the figures for me from his 

 original drawings. 



