. The Journal of laryngology and otology. l opening fordrainage was made that the interest of rhinologists was They began to attack the question from the nasal increased knowledge of lachrymal disease and its mode of originmade more clear to them the nature of the problem, and so greathas the recent advance been, that it may be said that its solutionis well in view. lachrymal apparatus concerned with the removal of the 170 The Journal of Laryngology, [April, i9i4. tears consists of the canalicuH, upper and lower, tlie lachrymal ortear sac, the lachrymal or
. The Journal of laryngology and otology. l opening fordrainage was made that the interest of rhinologists was They began to attack the question from the nasal increased knowledge of lachrymal disease and its mode of originmade more clear to them the nature of the problem, and so greathas the recent advance been, that it may be said that its solutionis well in view. lachrymal apparatus concerned with the removal of the 170 The Journal of Laryngology, [April, i9i4. tears consists of the canalicuH, upper and lower, tlie lachrymal ortear sac, the lachrymal or tear duct and its outlet. Both canaliculigenerally unite and open into the tear sac. This sac lies in thelachrymal fossa or groove (Figs. 1 and 2), the anterior half of whichis formed by the ascending process of the superior maxilla with thecrista lachrymal!s anterior, the posterior half by the lachrymal bonewith the crista posterior. These two halves are of unequal thick-ness, the former being thick compact bone, the latter usually thiu. Fiu. 1.—Sections sliowing relations of lachrymal fossa and naso-lachrymaldvict (after Fein), a. Orbit, b. Lachrymal fossa or groove, c. Bulging-of lachrymal duct. d. Antrum. and sieve-like. The groove lodges the tear sac, which intimatelyblends with its thin periosteum. On its inner aspect the grooveis covered by mucous membrane of the middle nasal fossa and isaccessible fiom that side. On its outer aspect the tear sac has nobony covering and is in relation to the structures about the innercanthus; hence it is possible to compress it from the outside —apoint of practical importance in the intra-nasal operation. The sacpasses below into the membranous tear duct, which is sheltered inthe naso-lachrymal canal and terminates in an outlet in the inferior April, 1914.] Rhinology, and Otology. 171 meatus. The bony outlet is found on the roof of the meatus at itshighest point, about the junction of the anterioi two fourths of theline of insertion
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Keywords: ., bo, bookcentury1800, booksubjectear, booksubjectnose, bookyear1887
