Stowell.J 4<Li [May 21, 



N. supra orbitalis (Fig. S-orb.). As this nerve crosses an arteriole 2-3 

 mm. peripherad of the muscle it divides into two terminal rami ; the 

 lateral ramus is directed laterad, and is given to the tactile hairs (Fig. 

 Pili) ; the mesal ramus unites in plexiform relations with other rami over 

 the forehead and the integument between the eyes. (I do not find a 

 lachrymal branch to this nerve.) 



N. oculo-nasalis (Fig. Nasalis) is the mesal ramus of the ophthalmic 

 nerve ; it is directed mesad upon the caudal surface of the globe ; it lies 

 entad of the rectus dorsalis muscle, ventrad of the ramus of the oculo- 

 motorius nerve (III.), which supplies the muscle, and dorsad of the optic 

 nerve ; it is apposed to the ophthalmic artery until it crosses the optic 

 nerve ; 8 mm. peripherad of origin at the lateral border of the rectus 

 dorsalis muscle it sends 2-3 filaments (Rx. louga) 6 mm. long ventro- 

 cephalad to join the ciliary nerve (these nerves are probably the radix 

 longa ganglii ciliaris of anthropotomy). Just laterad of the optic nerve a 

 considerable fascicle crosses the ophthalmic artery and rests upon the 

 dorsum of the optic nerve ; this is N. ciliaris longus. It gives 3-5 fila- 

 ments to the short ciliary nerve (cil. br.) ; about 2 mm. centrad of the 

 globe the nerve divides into 5-8 small fascicles, which perforate the scle- 

 rotic coat and lie along the ental surface of this tunic (I have not satisfac- 

 torily demonstrated the termination). Opposite the mesal border of the 

 optic nerve several filaments are given to the plexus carotideus (sympa- 

 thicus, Fig. Sym.). The nerve-trunk, the caudal ethmoid (Eth. ca.), 

 lies ectad of the mesal rectus muscle and entad of the trochlear ; it enters 

 the foramen ethmoideum caudale (Fm. eth. ca. ) (posterius), accompanied 

 by the arteria ethmoidea caudalis ; entad of the foramen, filaments of the 

 nerve are distributed (1) dorsad to the dura mater which covers the 

 olfactory lobes (Olf. ) ; (2) ventrad to the hypophysis (Hy.) ; (3) cephalad 

 to the ethmo-turbinated bone (Tur.) ; (4) mesad to join the platetrope 

 (Plat.) in the meson, while the ramus (Fig. externus) continues in a canal 

 or groove in the frontal and nasal bones just laterad of the meson to the 

 nasal cartilage (Ctl. nasalis), where it terminates in plexiform relations 

 with other ramuli of the trigeminus and facial nerves. 



N. infra trochlearis : Upon the dorsal border of the mesal rectus muscle 

 the largest, branch separates as the infra-trochlear nerve (Inf. tro.) ; this 

 rests upon the ectal surface of the muscle entad of the trochlear muscle, 

 and is directed cephalad to the border of the globe ; 8-10 mm. peripherad 

 of the origin this nerve gives off a filament which remains in the common 

 sheath for some distance, and is distributed to the trochlear muscle (M. tro.) 

 laterad of the " pulley ;" the main nerve lies ventrad of the pulley, and is 

 distributed to the conjunctiva (Cnj.) of the dorsal lid, the angle of the 

 eye (lacus lachrymalis) and the side of the nose; it sustains plexiform 

 relations witli terminal filaments of the supra-trochlear nerve (S. tro.) ; 

 centrad of the pulley a filament from the infra-trochlear nerve, together 

 with the arteria ethmoidea cephalica (anterior), enters the cephalic eth- 

 moid foramen (Fm. eth. ce.), and terminates upon the membrane over the 

 turbinated bones. 



