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uterotubal junction
The Uterotubal junction or Utero-tubal junction is the connection between the endometrial cavity of the uterus and the fallopian tube (uterine tube) at the proximal tubal opening, the beginning of the intramural part of the fallopian tube. Histologically, the endometrial epithelium changes over to the ciliated tubal epithelium.
==Function==
Patency of the utero-tubal junction is necessary for normal reproduction. The tubes can get blocked here by infection (salpingitis) and surgical intervention.
Mouse studies have indicated that selective passage of individual spermatozoa may occur at this junction, with abnormal morphology being identified as a significant selection criterion, leading to predominantly normal sperm passing towards the ovum. Absence of the protein calmegin has also been suggested as a critical factor for reliable sperm passage.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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