超軟X線装置を応用せる聴器骨化過程の胎生学的研究
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概要
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Ossification of the human ear in fetal stages was studied by using a soft X-ray apparatus (Softex Type CMB).Materials consisted of eight fetuses, from the 4 to 8th fetal month, with normal uterine life in normal pregnant women.X-ray photographs of the skull in all fetuses were taken from various directions to find the conditions of ossification of the temporal region.Besides, histological specimens of 3 fetuses with staining, were made to compare with the Xray findings.Conclusions were as follows:1. In Japanese fetuses, ossification of the temporal region first appeared at the tympanic ring in the 3rd fetal month and at the region of the lateral semicircular canal in the otic capsule during the 5th month.2. The otic capsule was ossified from the circumference of the lateral and superior semicircular canal ampullae. The posterior canal was most delayed in ossification in the otic capsule.3. Ossification of the auditory ossicles became evident from the 5th fetal month. The first ossification appeared at the head of malleus, body of the incus and the obturator surface of the stapes footplate.4. At the end of the 6th fetal month, ossification of the otic capsule and the auditory ossicles was mostly completed.5. Application of the soft X-ray apparatus to embryological studies was most valuable. Analysis of the details of soft X-ray photographs and its comparison to the histological findings will establish the process of ossification in the human ear during fetal life.
- 一般社団法人 日本耳鼻咽喉科学会の論文