THE PERIPHERAL NERVES AND THE SYMPATHETIC 



SYSTEM. 



By A. MELVILLE PATERSON, M.D., F.B.C.S. 



Professor of Anatomy in the University of Liverpool. 



THE nervous mechanism comprised under this title is responsible for the trans- 

 mission of peripheral impulses to the brain and spinal medulla, through afferent 

 nerves, and for the distribution of central impulses to peripheral structures through 

 efferent nerves. The peripheral nerves are at the outset divisible into two series : 



Posterior root 

 Ligamentum denticulatum 

 Anterior root 



Posterior root 

 Anterior root 



Fila radicularia of anterior root 

 Ligamentum denticulatum 

 Arachnoid 



_ Pia mater 

 Posterior root 



Spinal ganglion 

 Posterior ramus 



Posterior ramus 

 Anterior ramus 



Anterior ramus 

 Anterior root 

 Spinal medulla 



FIG. 601. SCHEME OF THE ARRANGEMENT OP THE MEMBRANES OF THE SPINAL MEDULLA AND 

 THE ROOTS OF THE SPINAL NERVES. 



cerebral nerves, derived from or associated with the brain; and spinal nerves, 

 in relation to the spinal medulla. Associated with the cerebro-spinal nerves is the 

 sympathetic system. The animal body is naturally divided into two different 

 areas or regions, the somatic area, forming the body wall and the associated limbs, 

 innervated by the larger (somatic) parts of the spinal nerves ; and the splanchnic 



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