CONNEXION OF THE NERVES WITH THE CORD. 



565 



anatomists of the present day, that the fasciculi of the spinal 

 nerves, are more or less connected at their origin with the 

 cineritious neurine of the spinal cord. Fig's 221 and $22, 

 represent the connexion of the spinal nerves with medulla of 

 the dog, and such as he proved it in man, in conjunction 

 with his colleague Mr. Cooper, and Professor Bischoff of 

 Heidelburg. 



Fig. 221 is the anterior surface of 

 the spinal cord, where is seen the 

 true roots of the anterior or motor 

 nerves. A, The anterior median 

 fissure, B, the anterior lateral. C C, 

 The anterior roots of the nerves ; 

 c' those running up the cord to the 

 - c * brain, and forming part of the 

 white matter encircling the gray 

 neurine, and called the cerebral or 

 true volition fibres, and c", spinal or reflex, seen dipping in the 

 gray matter of the cord. 



Fig. 222. Fig. 222, is a view of the posterior 



surface of the same cord. D, the 

 posterior median fissure, E, poste- 

 rior lateral ; F F, posterior root of 

 the nerves, dividing into f t cerebral 

 or true sensiferous fibres, which 

 run up on the posterior part of the 

 cord to the brain ; /', true spinal or 

 incident nerves according to Hall 



4 and Grainger, seen entering the 



gray substance of the cord. These 

 roots are invested with the gray 

 matter like the fibres from the crus cerebri in the corpus 

 striaturn. In fig. 218, is seen a plan of the arrangement of the 

 gray and fibrous structure seen in profile. 



All the parts within the cavity of the cranium to which the 

 medulla spinalis runs, are classed under the general name of 

 encephalon or brain, which consists of a variety of parts vary- 

 VOL. ii. 48 



