第1,第2鼓膜の相対関係に関する研究
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概要
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I The author observed the location of the second tympanic membrane through the perforation of the first t. m. on 200 patients with chronic middle ear infection and 13 patients with the traumatic injury of the tympanic membrane using otoscope.They were located postero-inferiorly to the first membrane.II Next, the author made microscopic examination of both membranes by serial sections of the ears of 10 rabbits and 7 human cadavers. The dimensional mutual relation ships of the membranes were studied by the projection method.By these methods, the ratio of the dimensions, the length and width, the angles and distances were measured.(1) The 2nd membranes was found to be more complicated in its shape, and was markedly concaved.(2) Portion of the connective tissue of the second membrane was loose and thickened, and some of the perilymphatic spaces were dilated.(3) The first and second membrane of the rabbits were 43.1mm2 and 3.5mm2 in dimension respectively. Those of the human cadavers were 58.7mm2 and 3.4mm2 respectively. The ratios of the dimension were 1 to 12.3 in rabbits and 1 to 17.3 in human cadavers.(4) The upper portion of the second membrane was almost rectangular to the first one, but the lower portion of the second menbrane formed more sharpe the curvature, the angle with the first membrane. was decreased.In average, the angles 61° horizontally, and 76° vertically.(5) It was 2.6-4.2mm on the rabbits, and 5.3-6.9mm on the human cadavers, from the posterior border of the first membrane to the anterior or posterior border of the second membrane in horizontal section.III On the ears of 7 human cadavers, the angles and distanoes between the main planes of the both membrnes were calculated by the trigonometry with X-ray photographs, which were taken solidgeometrically.They were 78° angle and 5.8mm in length.
- 社団法人 日本耳鼻咽喉科学会の論文