1 34 STRONG. [Vol. X. 



capsule it passes into its ganglion, composed of large ganglion 

 cells. It is a cutaneous nerve; and probably, as in the tadpole, 

 supplies the lateral sense-organs. These are here more irregu- 

 larly arranged. 



"Thus the dorsal VII has two ganglia, one on each of its 

 two main divisions, while the fasciculus communis component 

 has one at its point of forking. The motor portion (VII ab) is, 

 of course, non-ganglionated." — Quoted from (62). 



The Abdiicens. — As this nerve enters into close relations 

 with the VII and V, that part of its course connected with 

 them will be described here. It makes its exit from the ven- 

 tral side of the medulla in the same transverse plane as the 

 exit of the second root of the IX + X. It proceeds ectad and 

 curves cephalad lying a short distance mesad of the sympa- 

 thetic nerve. At 912 it crosses the sympathetic, now lying 

 ectad of the latter. At 806 it comes in contact with the ventral 

 side of the VII. It is imbedded in the mesal side of the ganglion 

 of the fasciculus communis component of the VII. Emerging 

 from the anterior end of this it separates from the R. palatinus 

 VII as the latter passes ventrad through the roof of the mouth, 

 lying immediately above the R. palatinus (747±) and below the 

 ganglion of the R. ophthalmicus trigemini. It now unites with 

 the ventral side of the R. ophthalmicus trigemini (734), slipping 

 around to the outer side of the latter. There seem to be 

 ganglion cells in connection with it (703), although these may 

 belong to the oculomotor nerve. The VI leaves the R. ophthal- 

 micus (697), and divides, the larger part proceeding cephalad 

 and ectad to the M. rectus externus, which it innervates. 



It may be as well to restate here concisely the relation to the 

 Gasserian ganglion proper of the various nerves and ganglia 

 which are connected with it. 



Running along the dorsal side of the Gasserian ganglion 

 proper is the dorsal half of the dorsal VII. Its ganglion is 

 fused with the dorsal side of the Gasserian ganglion. Next, 

 ventrally, are the ganglia of the Rr. maxillo-mandibularis and 

 ophthalmicus trigemini, which compose the great bulk of this 

 ganglionic mass, and constitute the Gasserian ganglion proper. 

 The ophthalmic portion — mostly indistinguishable from the 



