134 ON THE FUNCTIONS OF 



208. The spinal marrow is continuous with the brain,* 

 and may be said either to spring from the brain, as 

 from a root, or, on the contrary, to terminate in it and 

 grow into its substance, f Contained ill the flexible 

 canal of the vertebrae, it is enveloped by the same 

 membranes as the brain: its substance is also twofold, 

 bul the medullary is exterior to the cincritiotis. 



209. From these two sources — the brain and spinal 

 marrow, arises the greater part of those chords, which 

 are more or less white and soft, chiefly composed of 

 cellular canals containing nervous medulla, J and dis- 

 tributed throughout nearly all the soft parts : some 

 nerves, § however, may be more properly considered as 

 uniting with the brain and spinal marrow than springing 

 from them. (C) 



making some experiments with respect to it, in a young man eighteen years 

 old. When under five years of age, he had fallen from an eminence and frac- 

 tured the frontal bone on the left side of the coronal suture, since which time 

 there had been an immense hiatus, covered by !-.ierely a soft cicatrix and the 

 common integuments. The hiatus formed a hollow, deeper during sleep, and 

 varying according to the state of expiration ; very deep if he retained his 

 breath ; much more shallow, and even converted into a swelling, by a long 

 continued expiration. At the bottom of the hollow, I observed a pulsation 

 synchronous with the pulsation of the arterial system, such as deceived Petrioli, 

 Vandclli, and others, at one time the adversaries of Halk-r, who nil confoimded 

 it with that which depends upon respiration. — I may add, that this wound on 

 the left side of the head, had rendered the right arm and leg paralytic. 



• J. J. Huber, De medulla spinali. Clotting. 1741. 4to. The plate is to 

 be found among Nailer's fascic. i. tab. ii. 



Haller's ow»n plates of the same part are in the same fasciculus, vii. tab. iv. v. 



Monro .filius), Oh the NeYvom System, tab. x. fig. 1. 



•f Consult the. -fnatomie et Physiologic tlu systrme Nervettx, he. par F. J.GaO 

 ct G. Spurzheim. T. i. Paris. 1810. 4to. 



X Rt\\, De Struciura Nervorum. Hal. 1796. fol. 



Osiander, Conim. Soe. Rrg. Sic. Go/ling. T. rti. 



§ Rob. Martin's oration De Proprietatibus Nervorum g* Her alio rib us. prefixed 

 to his ftulit. Neurologic*. 



