654 



THE NERVOUS SYSTEM IN GENERAL. 



and its prolongation into the encephalon, the grey substance occupies the 

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

 envelops the white substance. 



Fig. 312 



Fig. 313. 



MICROSCOPIC GANGLION FROM HEART 

 OF FROG. 



BIPOLAR GANGLIONIC CELLS 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 whose structure has only 



Fig. 315. 



Fig. 314. 



STELLATE NERVE-CELL, FROM THE 

 NUCLEUS CERVICIS CORN U (POS- 

 TERIOR VESICULAR COLUMN) OF 



A FCETUS OF SIX MONTHS. 

 MAGNIFIED 420 DIAMETERS. 



STRUCTURE OF GANGLIONIC NERVE-CELL. 



A, According to Beale; B, Accoi'ding to 

 Arnold. a, Straight fibre; 6, Double 

 spiral fibre; c, Capsule of connective 

 tissue. 



recently been clearly established. These have been found in the sympatheti< 

 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 



