Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Ophthalmic Plast Reconstr Surg. 2012 Nov-Dec;28(6):463-6. doi: 10.1097/IOP.0b013e31826463d9.
To examine the relative positions of the lacrimal fossa (LF) and the bony nasolacrimal canal (BNLC) in relation to each other and a reference plane.
Forty-two orbits and BNLCs from 21 Asian cadavers (9 men and 12 women; average age at death, 84.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the LF and the medial half of the BNLC, the authors measured the angles of the longitudinal axis of the LF and the BNLC relative to the aesthetic horizontal plane respectively. Based on these values, the relative orientation of the LF and the BNLC was determined and defined in terms of Δ BNLC-LF. A positive Δ BNLC-LF represents a nasolacrimal canal that descends posteriorly relative to the LF.
The mean LF, BNLC, and Δ BNLC-LF were 9.5°, 19.8°, and 10.3°, respectively. In 39 passages (92.9%), the Δ BNLC-LF was positive, representing a nasolacrimal canal that is more posteriorly oriented than the LF. In 3 passages (7.1%), the Δ BNLC-LF was equal to or less than 0°; 2 of them (4.8%) had a straight course and 1 passage (2.4%) had a negative value.
In most patients, the BNLC is directed more posteriorly than the LF. This finding may help in preventing an inadvertent false passage during probing and intubation in patients with epiphora.
研究泪囊窝（LF）和骨性鼻泪管（BNLC）彼此之间以及与参考平面的相对位置。
使用来自 21 具亚洲尸体（9 名男性和 12 名女性；死亡时的平均年龄为 84.4 岁；年龄范围为 70-99 岁）的 42 个眼眶和 BNLC，这些尸体在使用前已用 10%缓冲福尔马林固定。暴露 LF 和 BNLC 的内侧半部分后，作者分别测量 LF 和 BNLC 的纵轴相对于美学水平面的角度。基于这些值，确定并定义 LF 和 BNLC 的相对方位，用 Δ BNLC-LF 表示。正值 Δ BNLC-LF 表示鼻泪管相对于 LF 向后下降。
平均 LF、BNLC 和 Δ BNLC-LF 分别为 9.5°、19.8°和 10.3°。在 39 个通道（92.9%）中，Δ BNLC-LF 为正值，代表鼻泪管比 LF 更向后定向。在 3 个通道（7.1%）中，Δ BNLC-LF 等于或小于 0°；其中 2 个（4.8%）呈直线型，1 个通道（2.4%）为负值。
在大多数患者中，BNLC 比 LF 更向后定向。这一发现可能有助于防止在溢泪患者中探查和插管时无意中造成假道。
