STRUCTURE OF THE SPINAL CORD. 



603 



whilst others seem to traverse it horizontally, so as to come into relation 

 [not improbably into actual continuity] with the posterior roots.' 



483. Thus we see that there are two very distinct courses pursued by the 

 Root-Fibres of the Spinal Nerves, in the substance of the Cord ; the first 

 transverse, the second loiiyitudinal. The fibres belonging to the former 

 category traverse the Cord horizontally or obliquely, and appear to pass 

 out in the other set of roots connected with the same segment, either on its 

 own or on the opposite side of the median fissure. Of those belonging to 



Antero-posterinr section through the lumbar enlargement of the human spinal cord, treated with 

 chloride of gold and potassium. Magnified 30 diameters, , anterior columns; b, anterior roots of 

 the nerves traversing the anterior columns obliquely ; c, anterior cornu ; d, posterior cornu, with the 

 vertical fasciculi ascending in front of the substantta gelatinosa; e, substautia gelatinosa, traversed 

 by horizontal fasciculi ; /, posterior column ; g, posterior roots of the nerves divided transversely in 

 consequence of their lateral entrance. 



the latter, a small part appears to connect the posterior roots directly with 

 the posterior columns, without passing into the vesicular substance; but the 

 remainder of those belonging to the posterior roots, first enter the gray matter 

 of the Cord, and then emerge from it either into the posterior column, or 

 into the posterior part of the lateral column of their own or of the opposite 



1 Those who are desirous of pursuing the structure of the Sf.inal Cord in more 

 detail than can possibly be given in an elementary treatise like the present, are re- 

 ferred to the important work published by Stilling in 18-36, entitled Neu'e Unter- 

 suchungen fiber den Ban des Riickenmarks, in 3 parts, with an Atlas; also to the 

 Untersuch. iiber den feineren BMU des Central Nervensystem des Menschen, by 

 J. v. Lenhossek, Wien, 1855; to the researches of Bidder and Kuptt'er, Ueber die 

 Textur des Euckenmarks, Leipzig, 1857; to the valuable papers in Ihe Philosophical 

 Transactions for 1851, 1853, 1858, part i, p. 231, 1859, part i, p. 437. by J. Loekhart 

 Clarke; to the Translation by the Sydenham Society of the Treatise of Schroder v. 

 d. Kolk, 1859; and to the essays of Dr. C. Frommann, Untersuch. lib. die Norm. u. 

 Path. Anat des Riickenmarks, Jena, 1864, 4 plates; the work of J. Luys, Reeherehes 

 sur le Systeme Nerveux Cerebro-spinal, Paris, 18G5, and Gerlach, in Strieker's Hu- 

 man and Comp. Histology, Syd. Soc. Trans., 1872, p. 327. 



