涙骨付近のX線解剖について

RADIOGRAPHIC ANATOMY OF THE LACRIMAL BONE AND ITS RELATED STRUCTURES

　I．はじめに

　篩骨眼窩板（紙様板）と涙骨とは眼窩内壁の主要な構成成分である。篩骨眼窩板と涙骨との前後径は各々が約35mmと9.5mmとであり，その比はほぼ3：1をなす。涙骨外面は篩骨蜂巣の前側方の隔壁をなし，内面は篩骨漏斗や中鼻道の側壁の一部をなす^1）。涙骨はまた涙嚢窩の内後壁をなす。鼻科学にとって涙骨は篩骨眼窩板と同様に重要な構造である。この論文において，後前方向（矢状方向）の普通X線撮影法による涙骨のX線解剖につき，従来の知見に若千の補遺を試みたい。

　Radiographic anatomy of the lacrimal bone and its related structures was studied using dry skulls with lead labels. Clinical casss with known bone destructions were also included in the analysis.

　So-called "lacrimale", the point where the posterior lacrimal crest meets with the frontolacrimal suture, was identified as a small thickened notch in the medial orbital walls in both Caldwell's and Waters' views. By Caldwell's view, the medial orbital wall makes two to three separate lines starting from the lacrimale. The most medial line corresponds to the posterior lacrimal crest and remaining lateral lines correspond to the posterior portion of the ethmoid orbital plate. By Waters' view, the medial orbital wall again makes two separate lines from the lacrimale. The medial line, in its intraorbital portion, corresponds to the posterior lacrimal crest and the lateral line to the anterior-superior portion of the ethmoid orbital plate. Anything superior to the lacrimale belongs to the frontal bone.