474 SPECIAL HISTOLOGY. 



course and distribution, present exactly the same conditions as 

 the motor-roots and muscular branches of the spinal nerves, 

 with the sole exception, that by all these nerves, from their 

 anastomosing with sensitive nerves, some sensitive fibres are 

 conveyed to the muscles. It deserves remark: 1. that accord- 

 ing to Rosenthal and Purkinje, nerve-cells exist in the trunk 

 of the oculo-motorius in the Ox, which, however, Bidder 

 (p. 32) was unable to find ; 2. that the facial-nerve, in its 

 gangliform enlargement, presents a number of larger nerve- 

 cells, through which, however, according to Remak, only part 

 of the fibres pass (Miill. ' Archiv/ 1841) ; 3. that according to 

 Volkmann (in Bidder's 'Ganglien-korper/ p. 68), the small 

 root of the hypoglossal nerve in the Calf, which is furnished 

 with a ganglion, produces motor effects. "What is the signifi- 

 cance of this occurrence of nerve-cells in motor-nerves has not 

 been ascertained. Probably simple fibres having a peripheral 

 destination arise from them, exactly as in the spinal ganglia. 

 In any case it shows that ganglia are not necessarily placed 

 only on sensitive nerves. The fifth, ninth, and tenth pairs, 

 resemble the spinal-nerves, inasmuch as that they all contain 

 motor and sensitive elements. In the trigeminus the small root 

 exhibits a preponderance of thick fibres ; the larger, numerous 

 fine fibres. The Gasserian ganglion, as well as the smaller 

 ganglionic body seated \ipon it, contains many larger and 

 smaller nerve-cells of 0008— 0030'", with nucleated sheaths, 

 and presents the same conditions, according to my observa- 

 tions, in small Mammalia and in Man, as a spinal ganglion, 

 that is to say, it is simply traversed by the fibres of the greater 

 root, and, from unipolar cells, gives origin to numerous nerve- 

 fibres of medium size, which go to join the emergent branches. 

 Bipolar cells also occur, but, as it appears, in less quantity, and 

 anything that can be said about apolar cells is as applicable 

 here as in the case of the spinal ganglia. The ultimate dis- 

 tribution of the n. trigeminus is for the most part similar to 

 that of the cutaneous nerves, and, in particular, the existence 

 of divisions of the nerve-tubes may be distinctly demonstrated 

 in the mucous membranes, as in the conjunctiva at the edge 

 of the cornea, in the ciliary ligament, in the tooth-pulp, and 

 in the papillae of the tongue. Terminal loops and free ter- 

 minations appear to exist in the papillae of the mucous mem- 



