ORGANS OF SENSE. 167 
bree ; c, lachrymal gland; d, its division into two lobes; e, excretory ducts 
of the lachrymal gland; f, their openings; g, conjunctiva; , Meibomian 
glands; i, superior punctum lachrymale ; *, Meibomian glands of the lower 
eye-lid ; J, inferior punctum lachrymale; m, caruncle. Fig. 5, nearly the 
same view, but magnified: a, orbicularis muscle; b, rima; c, levator palpe- 
bree ; f, openings of the excretory ducts of the lachrymal glands; g, conjunc- 
tiva; 4, Meibomian glands of the upper eye-lid; 2, portion of the conjunctiva 
reflected, to lay bare the Meibomian glands; k, openings of these glands; 
J, glands of the lower eye-lid. Fig.6, Meibomian glands, highly magnified. 
Fig. 7, inside of the eye-lids, with the puncta lachrymalia. Sig. 8, lachry- 
mal apparatus: abcd, upper and lower lachrymal canals; ef g, lachrymal 
sac; hi, nasal portion of the lachrymal sac; kJ, lachrymal glands. Fig. 9, 
muscles of the left eye-ball: *’*, outline of the orbit; *, pulley for the tendon 
of the trochleator or superior oblique muscle; * eye-ball; °’, optic nerve; 
a to e, levator palpebre superioris; fg, superior, hik, external rectus; 
i, inferior oblique; m, inferior rectus; 7 0, internal rectus; p to s, superior 
oblique muscle of the eye. Fg. 10, the same view, the levator palpebre 
removed ; °’, optic nerve ; g, superior rectus removed; h to 0, the same as 
in the preceding figure; p to u, superior oblique muscle. Fig. ll abe, 
internal rectus ; def, inferior, gh1, external rectus ; k/m, inferior oblique 
muscle. Fig. 12, nerves belonging to the eye; *, optic nerve; *, third cere- 
bral nerve or oculomotor; x, branch from it to the internal rectus muscle; 
‘fourth cerebral nerve; a, branch from the fifth pair; °, fifth cerebral nerve; 
A, central extremity; 8, plexiform swelling; o, first branch; p, second do. ; 
E, third do.; Fr, foramen ovale; ¢, foramen rotundum; @, communicating 
branch between the fourth and fifth nerves; 0 to 2, frontal branches; & to y, 
distribution of the lachrymal nerve; °°’, sixth cerebral nerve. Fig. 18, 
ramifications of the third pair of nerves, and the ciliary ganglion: a, supe- 
rior rectus muscle; B,B, levator palpebre ; *, third cerebral nerve ; a b, small 
upper branch; ¢, branch to the superior rectus; d, branch to the levator 
palpebree ; e, inferior branch; f, branch to the inferior rectus; g, lower 
branch ; h, branch to the ophthalmic ganglion; 77, branches to the inferior 
oblique muscle; kkk llim, branches proceeding from the ophthalmic gan- 
glion (ciliary nerves) ; °, fifth cerebral nerve; n, first branch; opqr, four 
branches of the latter ; ¢, branch to the nares; uw, thread connecting it to the 
nerve of the superior rectus ; v, branch to the ophthalmic ganglion ; ° w, sixth 
cerebral nerve. Fig. 14, nerve of the inferior rectus muscle; branch from 
the fifth and sixth pairs to the nares: a, fifth cerebral nerve; B, Casserian 
ganglion ; ©, first, p, second, x, third branches of do; r,r, lesser portion; 
G, superior oblique muscle; b to v, the same as in the preceding figure ; 
tz, inferior trochleator nerve; «a, sixth cerebral nerve; 6, branches of 
the sixth nerve to the carotid plexus; , branch to the external rectus. 
Fig. 15, ramifications of the left ophthalmic artery: a to p, orbit; », leva- 
tor palpebre, cut through and reflected ; r G, superior rectus; u, internal 
rectus; xk, external rectus; L, optic nerve; M, eye-ball; nop, carotid 
artery; ar, ophthalmic artery; a ), ciliary arteries; c, artery to the lachry- 
mal gland ; d, ciliary branch of do. ; e, feeble branch to the external rectus; 
873 
