462 
ME. J. L. OLAEKE ON THE GEET SUBSTANCE OF THE SPINAL COED. 
large ceUs, and crossed in different directions by the posters 
nerves and by fibres which radiate to the white colum . - 1 
of the cervu Ld caput cornu, near the right border of the grey 
a e fil large bundTes of longitudinal fibres, interlaced by^— rse fibres^ 
“d Jore o?iess encircled by large elongated nerve-cells, which send some of 
’ of fhe domal region of the Ox. drawn from a p^paration 
D, D, posterior cornua, the points of which are cu , 
side the letter D is in the darker portion of the caput cornu. The nei - 
!eli: ™ shown chiefly on the right side. ,, the gelatinous subs ance 
E,E, anterior cornua; F, tractus 
its cells are seen extending into the lateral column towards the letter . 
r cenXLl, lined witl epithelium, from which fibres radiate m con- 
nexion with small cells and nuclei, through the 
space H ■ behind H is the posterior transverse commissure, 
Xkh are in connexion with fusiform cells, and partly extend outvvards to 
• the tractus intermedio-laterahs, F; I, two bundles of longitudmal fibres, 
cut off from the anterior columns by transverse fibres of the anteiior com- 
missure K K; L, anterior median fissure; 1, posterior median fissuie. 
r rbundies of poMerior nerve-roots; M, M, cylinders of the irsi- 
L; colu,nns ; I three bundles of longitudinal .“J 
the nrey substance, and two of which are seen to be paltiall) embiace J 
nervicllls; T, fibres of the posterior coinmissme extending outw ai s, «, o 
ddrof cervix cornu posterioris of left side, where there is a decussation 
between the fibres of the posterior roots, in connexion wi* the posteiioi 
vesicular columns and the posterior commissure; o, anterior roots of 
V S Plate' XXI Transverse section of the grey substance of the Ox, at the upper 
’ part of the dorsal region, where the posterior cornua are beginning to sepa- 
P • i .1 ■ iriio linp' P* ti’cictus iiit0riiipclio“l9.tpi tills, 
rate from each other in the middle line.— b, thP front 
extending inwards towards the posterior transverse commissure, and 
of the posterior vesicular column. i . . owtl nf thp ceiuical 
Fig. 4, Plate XX. A similar section, higher up, neai- the ouei 
Pigs. .5 to 2 ltf — rse sections of the grey substance of the spinal cord, horn a 
Fig 5 PlI^XXI. lection’'near the middle of the dorsal region:— F, tractus inter 
medio-lateralis; M, posterior vesicular column. 
1 ." e Plate XXI Another, at the upper part of the dorsal region. 
bI; t: reSl. A similar section through the lower part of the cervical enlarge- 
