THE NERVOUS SYSTEM IN GEN Ell A L. 



741 



To these two elements is added a large quantity of hi nod-vessels y which are 

 incomparably more abundant in the grey than in the white sulwtance. It must 



Fig. 409, 



MULTIPOLAR OR STELLATE GAMOLIOSIC NERVE-CSLL, WITH ONE OP ITS PROLOVGATIONS — 

 a. Becoming continuous with tiie axis-cyiiader of a double-coutouied aerve-(ibre, b. 



Fig. 410. 



SEVKRAL MULTIPOLAR NERVE-CELLS. 



be added that in the grey substance the chief ele- 

 ments are these ganglionic cells, supported or bound 

 together by neuroglia., distinct from connective tissue. 



In the nerves, the elementary tubes are alone met 

 with ; they are disposed in long bundles, which are 

 collected into successively increasing fasciculi. A 

 cellulo-vascular envelope — the neiiriJemma (or j)eri- 

 ne^irium) — binds all these fasciculi into a single cord, 

 and foiTus a special sheath around each of them. 

 The details of their organization will be referred to 

 hereafter. 



It is adiflitted that the ganglionic nerves, or 



PYRAMIDAL CELL OF THE 6RET 

 SDBSTANCE OF THE BRAIN 

 CORTEX. 



N, Nucleus; a, n, small ramified 

 protojilasmif prolongations ; 

 c, prolongations of the base 

 of DfitfT^ (bringing the cells 

 into lonimunication with the 

 axis-cvlinder of the nerve- 

 fibre). 



