386 HOWARD AYERS 
floor of nose, dorsal wall of the mouth, and to the hypophysial 
canal; 6) to the fat-body on the opthalmic nerve; 7) to the sides, 
dorsal and ventral faces of the nasal tube out to the tip of same; 
8) to the roof of the mouth and nasal capsule and nasal tube; 
9) five branches to connective tissue and mucosa of the roof 
mouth and to the palatine tooth; 10) to the nerve net of the jaw 
apparatus; 11) branches to each nasal fold, companions of the 
branches of the olfactory nerve in the innervation of the sen- 
sory olfactive epithelium. 
The nasalis nerve is clearly the most anterior nerve of the 
trigeminal complex for two reasons. In the first place, it retains 
its own independent roots of origin from the central nervous 
system which leave the medulla in part at least mesial to those 
of the ophthalmic, and, in the second place, because the periph- 
eral distribution of its fibers is to structures lying in general 
mesad of those supplied by the ophthalmic nerve whose territory 
lies laterad and consequently morphologically caudad to nasalis 
territory. It carries motor fibers and innervates the nasalis 
among other muscles. It is therefore a mixed nerve. 
The terms nerve veil and nerve network refer to the nerve 
structures of the distal portion of the jaw apparatus of Bdello- 
stoma which represent the jaw plexuses of Amphioxus. The 
characteristics of this plexiform structure will be given when we 
come to the branchings of the jaw nerves in and about the snout, 
buccal rim, and tentacles. 
The term fat-body will be used to designate a variety of lip- 
oid structures varying from the continous dermal sheet to large 
and small, continuous and limited bodies about the nerves on 
and between the muscles, to others attached to the connective 
tissue sheets in the interspaces between the organs, about the 
nasal capsule, the eye, and optic nerve. Usually they receive 
branches from a passing nerve, with surprising frequency they 
receive the whole of the terminal branches of relatively large 
nerves, thus forming an end-organ. They are evidently often 
more than accumulations of fat in the connective tissue. Am- 
phioxus lacks such structures entirely, but they play an important 
part in the organization of the nervous apparatus of Bdellostoma. 
