530 



THE SPINAL CORD. 



but the anterior gray commissure is separated from the bottom of the ante- 

 rior fissure by a band of white matter, called the anterior white commissure, 



FIG. 119. 



P.F 



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

 Thoracic (Dorsal) Nerve. (Sherrington.) 1 Magnified 15 times. One lateral half only is shown. 

 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 gray matter has been 

 made thick and dark in order to render it conspicuous. A. F., antetror fissure; P. -F., posterior 

 fissure ; c. c., central canal ; c. g. s., central gelatinous substance ; A. r., anterior root : P. ?'., lateral 

 (or intermediate) bundle; P. ?'., median bundle or posterior root of spinal nerve; p' p" fibres of 

 posterior root passing, p' indirectly through the substance of Rolando, p" directly into gray mat- 

 ter ; a. g. c., anterior gray commissure ; p. g. c., posterior gray commissure ; 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, c. p., from the median posterior column, or column of Goll, m.p. 1, cells of the anterior 

 horn ; 3, posterior column, or vesicular cylinder, or column of Clarke, the area of the cylinder 

 defined by a dotted line ; 4, cells of the intermedio-lateral tract or 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 1 am deeply indebted to my friend and former 

 pupil, Dr. Sherrington, who has kindly prepared the figures for me from his original 

 drawings. 



