MENINGES OF THE SPINAL CORD 



733 



posterior septum of tlie spinal cord, and serves to conduct blood-vessels to the cord. 

 The space is also partially divided into a posterior and an anterior compartment 

 by the ligamentum denticulatum. 



The PIA MATER of the cord consists of two layers, an outer and an inner, the 

 latter of which represents, and is continuous with, the pia mater of tlie brain. 

 Both layers dip into the anterior fissure of the cord, and the inner layer is 

 continuous with the posterior septum. The outer layer is strong and fibrous, and 



Fig. 437. — Posterior View of the Medulla Oblongata and of the Spinal Cord, with 

 ITS Coverings and the Roots of the Nerves. (Hirschfeld and Leveille.) 



MIDDLE 



PEDUNCLE ( 

 ISFERIOR 

 I'EDVSCLE 



CLA VA 



C. I. 



II. 



SUPERIOR PEDUNCLE 

 OF THE CEREBELLUM 

 SULCUS LONGITUDI- 



XALIS MEDIUS 

 GLOSSO-PHARYNGEAL x. 

 VAGUS 



SPINA L A CCESSOR Y 



Ligamentum 

 denticulatum 



POSTERIOR 

 LONGITUDINAL 

 FISSURE 



AN ANTERIOR ROOT 

 A POSTERIOR ROOT 



XL 



NIL- 



L. /.- 



llr 



IIL — < 



/I-.— C 



CONUS 

 MEDUL- 

 LARIS 



FILUM TER- 

 MINALE 

 SUR- 

 ROUNDED 

 BY CAUDA 

 EQUINA 



GANGLION 

 ON A 



/'OSTERIOR 

 ROOT 



presents certain localised thickenings which require separate description; these are 

 the ligamentum denticulatum and the linea splendens. The filum terminale may 

 be conveniently described along with these. 



The ligamentum denticulatum is a fibrous band which is attached on each 

 side of the cord about midway Ijetween the anterior and posterior nerve-roots. It 

 is continuous by its inner margin with the pia mater. Its outer margin is charac- 

 teristically scalloped or denticulated, and presents about twenty-one pointed pro- 

 cesses by which it is attached to tlie dura mater. These processes do not pierce the 



