DISTRIBUTION OF THE NERVES IN THE SALIVARY GLANDS. 447 



The structure of the larger ganglia which are found in the 

 course of the nerve fibres and trunks still remains to be con- 

 sidered. The ganglion cells occur partly isolated and partly in 

 groups which accompany the nerve cords for a considerable 

 distance, or form roundish knots enclosed by a dense sheath of 

 connective tissue. These knots attain the size of O'OGO milli- 

 meter and more. The nerve cells lying in their interior (fig. 

 91) have a diameter of O028 millimeter, with a nucleus of the 

 diameter of O012, and a nucleolus of 0'002 millimeter in 

 diameter. 



We meet also with much smaller ganglion cells, which are 

 not larger than salivary cells, with a diameter of or about 0'014 

 millimeter. The cells accumulated in one group do not mate- 

 Fig. 91. 



Fig. 91. Ganglionic knot from the submaxillary gland of a Kabbit. 

 Magnified 480 diameters. 



rially differ from one another in their general magnitude. The 

 ganglion cells include a spheroidal or oval, transparent, delicate, 

 but sharply defined nuclear vesicle, and when in their fresh 

 state their protoplasm is very delicate and confusedly granular. 

 In the smaller forms the cell contents are sometimes rather 

 more granular, but the nucleus is always as clear as water. The 

 groups are constantly in connection with afferent and efferent 

 nerve fibres. In some instances a single ganglion cell is found 

 in the course of a fibre of Remak. It is remarkable that a 

 large ganglion cell of this kind, having a diameter of O042 

 millimeter (see fig. 92), may contain several nucleoli; and, 

 moreover, at the point of transition into the nerve fibre, may 

 present a slight deposit of protoplasm, with several ganglionic 



