THE INFRA-ORBITAL TRUXK. 177 



cutaneous, the motor V, the acustico-lateralis, the com- 

 munis and a large sympathetic element. The communis 

 element also may in some forms, as the sturgeon, go out 

 as a separate nerv^e. 



These components leave the ganglionic complex in a 

 single compact trunk passing laterad, ventrad and slightly 

 caudad from the ganglia. The V -f- VII ganglionic com- 

 plex is all intra-cranial except the Gasserian ganglion. 

 At about 500 (Fig. 22) the complex becomes narrower, as 

 all of the VII ganglia lie caudad of this point, while most 

 of the Gasserian ganglion lies cephalad; and here the 

 whole of the complex (with the exception of the truncus 

 hyomandibularis, the palatine and pre-trematic rami and 

 one root of the r. lateralis accessorius, which have been 

 previously given off) turns abruptly outward and emerges 

 from the cranium through a single foramen and continues 

 cephalad along the outer surface of the cranial wall. 



The general cutaneous fibres arise from about the middle 

 of the ventral side of the Gasserian ganglion. From the 

 extreme caudal edge of the ganglion a small fascicle of 

 cutaneous fibres emerges through a separate foramen and 

 joins the truncus hyomandibularis, as already described. 

 A similar fascicle arises from the ventral edge of the 

 Gasserian ganglion near its cephalic end (485), curves 

 back along the mesal face of the infra-orbital trunk at its 

 origin, follows for a short distance the r, opercularis V 

 (/. f. I, Fig. 22), then separating from that nerve con- 

 tinues caudad along the dorsal border of the m. adductor 

 arcus palatini, it joins the fascicle from the caudal end 

 of the Gasserian ganglion (Fig. 2, t. f. i) and the two 

 together enter the truncus hyomandibularis. 



Of these rami communicantes n. trigemini ad n. faci- 

 alem, I can find no mention of the more caudal one, while 



