Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/80125
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Type: Journal article
Title: The narrowest part of the bony nasolacrimal canal: an anatomical study
Author: Takahashi, Y.
Nakamura, Y.
Nakano, T.
Asamoto, K.
Iwaki, M.
Selva-Nayagam, D.
Leibovitch, I.
Kakizaki, H.
Citation: Ophthalmic Plastic and Reconstructive Surgery, 2013; 29(4):318-322
Publisher: Lippincott Williams & Wilkins
Issue Date: 2013
ISSN: 0740-9303
1537-2677
Statement of
Responsibility: 
Yasuhiro Takahashi, Yasuhisa Nakamura, Takashi Nakano, Ken Asamoto, Masayoshi Iwaki, Dinesh Selva, Igal Leibovitch and Hirohiko Kakizaki
Abstract: To determine the narrowest diameter of the bony nasolacrimal canal.Fifty-eight bony nasolacrimal canals from 29 Japanese cadavers (12 men and 17 women; average age at death, 83.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the medial (44 canals) or posterior half (14 canals) of the bony nasolacrimal canal, the part with the shortest anteroposterior or transverse diameter was determined on inspection. These positions from the canal entrance were measured, and the distance ratio, indicating where the shortest diameter was located in relation to the total length of the canal, was calculated.The shortest anteroposterior and transverse diameters were at the entrance to the canal in 32 of 44 canals (72.7%) and in 9 of 14 canals (64.3%), respectively. In the other canals, the shortest anteroposterior and transverse diameters were located at an average of 3.6 and 5.6 mm from the entrance, and the distance ratios were 29.0% and 46.7%, respectively. The mean shortest anteroposterior and transverse diameters were 5.6 and 5.6 mm, respectively.The shortest anteroposterior and transverse diameters were at the entrance of the canal in most of the bony nasolacrimal canals. These results are comparable with the rate of obstruction at the canal entrance in primary acquired nasolacrimal duct obstruction.
Keywords: Orbit; Frontal Bone; Nasolacrimal Duct; Humans; Cadaver; Anatomy, Regional; Aged; Aged, 80 and over; Asian Continental Ancestry Group; Female; Male
Rights: © 2013 by The American Society of Ophthalmic Plastic and Reconstructive Surgery, Inc., All rights reserved.
RMID: 0020130784
DOI: 10.1097/IOP.0b013e31828de0b0
Appears in Collections:Opthalmology & Visual Sciences publications

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