SENSE ORGANS OF AMIURUS. 367 
surface of the skull a strong branch enters the nasal barblet, and 
the rest passes toward the middle line, a branch being given off along 
the medial border of the nasal sac as far as the extremity of tho,;snout. 
(Fig. 4, Pl. IV.) 
The ramus ciliaris takes origin from the ophthalmicus after that 
nerve has separated from the trigeminal complex, but within the 
cranial cavity, and partly also from the supero-lateral strand. It 
escapes into the orbit by a foramen lateral to that for the 2. ophthal- 
micus profindus. -Its branches there are partly represented in 
Mig.3, Pl. IV. 
The ramus buccalis emerges through the same foramen as the 
supero-lateral strand, but in a separate sheath. At its origin from 
the trigeminal complex it is very closely connected with the ramus 
ophthalmicus superficialis, although it contains fibres other than those 
derived from the tuberculum acusticum. In dissecting the ramus 
maxillo-mandibularis from the upper sarface after reflection of the 
eye, the ramus buccalis is found on the surface of that nerve. As it 
courses forwards it divides into two branches, of which the deeper 
and more medial accompanies the ramus mawillaris to the sub- 
cutaneous tissue below and outside the nasal sac, and the lateral and 
more superficial is destined for the infraorbital mucous canal. A 
cutaneous branch becomes superficial at the posterior inferior angle 
of the orbit (Fig. 3, Pl. [V.), and afterwards communicates with a 
cutaneous branch of the facial below the edge of the adductor man- 
dibule. 
The remaining branches of the fifth proper are formed from the 
supero-latera] and infero-medial strands after they have emerged 
from the skull. The mode in which this is effected may be seen 
from Fig. 1, Pl. [V., which represents a dissection from the roof of the 
mouth. 
Ramus cutaneus palatinus.—This small branch is derived from 
the infero-medial strand just after its escape. It ramifies in the 
mucous membrane of the roof of the mouth over the M. adductor 
arcus palatini, but also sends a branch backwards to the mucous 
membrane lining the gill-cover, and covering the adductores hyoman- 
dibularis and operculi. 
Ramus palatinus.—This is a large branch of the infero-medial 
strand which runs forwards between the adductor arcus palatini and 
the skull, being flattened between the ligamentous attachment of 
