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食道異物の嵌在部位は恩師笹木教授の明治42年〜昭和6年(23年間)の調査統計に依れば,第一狭窄部234例,第一第二狭窄の中間38例,第二狭窄部91例,第二第三狭窄の中間8例,第三狭窄部13例であつた。又笹木教授開講以來の教室10年間100例の統計では殆んど第一狭窄部であつて,第二狭窄部は僅に3例(カーテン用針金の輪,鉛批把の種)と別にセルロイド製藥匙が1例あつたのみである。斯くの如く解剖學的には最も狭隘な食道入口部を通過し得た食物或は異物が,それ以下の部位に嵌在,閉塞することは比較的少い。
この樣な異物症の成因として従來擧げられていたものは,異物自身が原因である場合は異物に炎鋭な突起又は鈎を有するため食道壁に刺入した場合か,又は食道腔内徑に比し巨大である場合であり,他方食道自身の原因としては食道壁に器質的變化として癌腫,瘢痕狭窄等,機能的變化として痙攣,或は又食道外の疾患に基く壓迫等のため食道腔の狭窄を來している場合等である。
MUKUNO makes observations on 3 cases of esophageal foreign body that occurred at the region of so-called 2nd constriction by ob-jects which were neither pointed nor sharp. The causative agent in a woman aged 57 was a piece of cuttle fish; in a woman aged 42, by a piece of meat; in an infant aged 2 years and 9 months, by paper currency. The author maintains that the site of obstruction is not precisely at the 2nd esophageal constriction which has been generally understood as the site of predilection from anatomico-physiological point of view but, it is in the region where the middle third of the esophagus joins the lower third or about the point where the muscula-ture of the esophageal wall begins to be composed solely of smooth muscles. The cause of spasm and obstruction in this area rests more or less on peculiaries of anatomical structure of the organ, of actions of the smooth muscles and of the nerve supply; beyond which and added to is the peculirity of unusual stimulation of the sympathetic nervous system. The author believes that the name, area of functional constriction, is more appro-priate for this region of the esophagus.
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