THE SYMPATHETIC NERVOUS SYSTEM. 223 



of the sympathetic system, but among them are some of 

 larger size like those of the Gasserian ganglion. The 

 caudal end of the ganglion is composed chiefly of the 

 larger cells, the cephalic end contains a few of them, 

 while the middle of the ganglion is composed wholly of 

 the very small ones. Some of the fibres of the radix 

 longa seem to run through the ganglion without loss of 

 their sheaths, while none of those of the radix brevis 

 appear to do so. The radix brevis arises from the division 

 of the oculomotorius for the internal and inferior recti 

 muscles shortly after its separation from the trunk. The 

 tiny twig from the first sympathetic ganglion joins the 

 same division just before the radix brevis. The ciliary 

 ganglion is drawn on Fig. 4 as if it lay on the dorsal side 

 of the III nerve. It really lies on the lateral side. The 

 ramus ciliaris brevis distally of the ciliary ganglion is 

 drawn as if it contained only sympathetic elements. It 

 may contain general cutaneous, though they could not be 

 separately distinguished. 



The mode of origin of the radix longa of the ciliary 

 ganglion is somewhat different on the opposite side of this 

 specimen. The first sympathetic ganglion is, as before, 

 very intimately united to the Gasserian ganglion and the 

 ramus ciliaris longus arises apparently from the sympa- 

 thetic ganglion only. A small number of medullated 

 fibres, which can be traced back through the Gasserian 

 ganglion and are therefore probably trigeminal root fibres, 

 can be traced from the Gasserian ganglion through the 

 sympathetic ganglion and into the radix longa of the 

 ciliary ganglion. These are accompanied in their course 

 by a small number of large ganglion cells and after the 

 separation of the radix longa from the sympathetic gan- 

 glion the number of these large cells is greatly increased. 



