654 



THE NERVOUS SYSTEM IN GENERAL. 



and its prolongation into the encephalon, tlie grey substance ocrapies the 

 interior, while it is spread over the exterior ' of the encephalic lobes and 

 envelops the white substance. 



Fi?. 312 



Fig. 313. 



MICKOSCOPIC GANGLIOIt FROM HEART 

 OF FEOG. 



BIPOLAR GANGLIONIC CELIB AND NERVE- 

 FIBRES, FROM GANGLION OF FIFTH PAIR 

 IN LAMPREY. 



(In some instances, as in the cells of various parts of the spinal cord, 

 the prolongations subdivide and ramify in a curious manner, and form a close 

 network that penetrates the surrounding nervous tissue. In addition to 

 these, there are other very complex nerve-cells whoso structure has only 



Fig. 315. 



Fig. 314. 



STELLATE NERVE-CELL, PROM THE 

 NUOLEOS CERVICIS CORNU (POS- 

 TERIOR VESICULAR COLUMN) OF 

 A F(ETUS OF SIX MONTHS. 

 MAGNIFIED 420 DIAMETERS. 



STRUCTURE OF GANGLIONIC NERVE-CELL. 



A, According to Beale ; B, According to 

 Arnold. — ci, Straight fibre ; h, Double 

 spiral fibre ; c. Capsule of connective 

 tissue. 



recently been clearly established. These have been found in the sympathetic 

 ganglia, and each is invested in a capsule of connective tissue. In shape, 

 the cell is pyriform, and it contains a nucleus ; from the narrow end spring 

 two fibres, that pass in opposite directions when they reach the nervous 



