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The Uterotubal junction or Utero-tubal junction is the narrow opening between the uterus and the fallopian tubes. At this junction, selective passage of individual spermatozoa has been suggested^[1], with abnormal morphology being identified as a significant selection criterion, leading to predominantly normal sperm passing towards the ovum.^[2]. Absence of Calmegin has also been suggested as a critical factor for reliable sperm passage.^[3]

[edit] References

^ Nakanishi, T.; Isotani, A.; Yamaguchi, R.; Ikawa, M.; Baba, T.; Suarez, S.; Okabe, M. (Sep 2004). "Selective passage through the uterotubal junction of sperm from a mixed population produced by chimeras of calmegin-knockout and wild-type male mice" (Free full text). Biology of reproduction 71 (3): 959–965. doi:10.1095/biolreprod.104.028647. ISSN 0006-3363. PMID 15151931. http://www.biolreprod.org/cgi/pmidlookup?view=long&pmid=15151931. edit
^ Narita, M.; Kimura, K.; Tanimura, N.; Arai, S.; Tsuboi, T.; Katsuda, K. (Aug 1974). "The Passage of Abnormal Spermatozoa Through the Uterotubal Junction of the Mouse". Reproduction 38 (2-3): 81. doi:10.1530/jrf.0.0380081. ISSN 0021-9975. PMID 11032665. edit
^ Nakanishi, T.; Isotani, A.; Yamaguchi, R.; Ikawa, M.; Baba, T.; Suarez, S.; Okabe, M. (Sep 2004). "Selective passage through the uterotubal junction of sperm from a mixed population produced by chimeras of calmegin-knockout and wild-type male mice" (Free full text). Biology of reproduction 71 (3): 959–965. doi:10.1095/biolreprod.104.028647. ISSN 0006-3363. PMID 15151931. http://www.biolreprod.org/cgi/pmidlookup?view=long&pmid=15151931. edit

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[0] Nakanishi, T.; Isotani, A.; Yamaguchi, R.; Ikawa, M.; Baba, T.; Suarez, S.; Okabe, M. (Sep 2004). "Selective passage through the uterotubal junction of sperm from a mixed population produced by chimeras of calmegin-knockout and wild-type male mice" (Free full text). Biology of reproduction 71 (3): 959–965. doi:10.1095/biolreprod.104.028647. ISSN 0006-3363. PMID 15151931. http://www.biolreprod.org/cgi/pmidlookup?view=long&pmid=15151931. edit

[1] Narita, M.; Kimura, K.; Tanimura, N.; Arai, S.; Tsuboi, T.; Katsuda, K. (Aug 1974). "The Passage of Abnormal Spermatozoa Through the Uterotubal Junction of the Mouse". Reproduction 38 (2-3): 81. doi:10.1530/jrf.0.0380081. ISSN 0021-9975. PMID 11032665. edit

[2] Nakanishi, T.; Isotani, A.; Yamaguchi, R.; Ikawa, M.; Baba, T.; Suarez, S.; Okabe, M. (Sep 2004). "Selective passage through the uterotubal junction of sperm from a mixed population produced by chimeras of calmegin-knockout and wild-type male mice" (Free full text). Biology of reproduction 71 (3): 959–965. doi:10.1095/biolreprod.104.028647. ISSN 0006-3363. PMID 15151931. http://www.biolreprod.org/cgi/pmidlookup?view=long&pmid=15151931. edit

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