The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . gat the outer aspect of the superior fornix. The blood supply of the lachrymal gland is from the lachrymalbranch of the ophthalmic artery. The sensory nerve supply to the lachrymal apparatus is from thelachrymal branch of the ophthalmic or first division of the fifth;the secretory function of the gland is regulated by the sympathetic. The excretory portion of the lachrymal apparatus consists in the ANATOMY (GROSS) OF THE HUMAN EYE 351 canaliculi, the lachrymal sac, and
The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . gat the outer aspect of the superior fornix. The blood supply of the lachrymal gland is from the lachrymalbranch of the ophthalmic artery. The sensory nerve supply to the lachrymal apparatus is from thelachrymal branch of the ophthalmic or first division of the fifth;the secretory function of the gland is regulated by the sympathetic. The excretory portion of the lachrymal apparatus consists in the ANATOMY (GROSS) OF THE HUMAN EYE 351 canaliculi, the lachrymal sac, and the nasal duet which is continuouswith the sac. The canaliculi have their origin in minute whitish elevations—theimncta laclirymali<i—which, as before mentioned, are situated on thelid-margins about 6 mm. from the angle of the inner canthus, or atthe inner termination of the tarsal cartilages. The first millimeterof their course is in a vertical direction—upward in the upper lid,and downward in the lower lid; after this they turn at an acute angleand run 5 or 6 mm. in the direction of the nose. They either meet. The Lachrymal Apparatus Showing the Xasal Eelations. (After Quain.) a,The Upper and Lower Canaliculi; c, Xaso-Lachrymal Duct; b, e, f, TurbinalBones; g, Antrum of Highmore. and form a common canal, or empty separately into the lachrymalsac; generally the former. They are lined by pavement epithelium. The lachrymal sac is 12 mm. long and 6 mm. wide; it opens directlyinto the nasal duct. Its upper extremity, which has no outlet, liesbehind and a little above the ligamentum palpebrsE mediale, the en-tire sac completely filling a groove in the lachrymal bone in whichit rests. The epithelium of its lining mucous membrane is of thecylindroid variety, and is continuous with that lining the nasal duct. The n-asal duct is directly continuous with the lachrymal sac. Itis about 21 mm. long, and -4 to 6 mm. wide, but by no means uniformin its diameter. There is a slight co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectophthalmology, bookye
