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Is the testis intraperitoneal?

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Abstract

The relationship of the testis to the peritoneal cavity, and hence its position as an intraperitoneal or extraperitoneal organ, remains controversial. Adult anatomy texts favour an extraperitoneal position during and after testicular descent, whereas journal articles favour an intraperitoneal position. Interestingly, there is no similar debate around the position of the ovary despite the common origin of each as indifferent gonads. Through direct observation and the literature review, we aimed to determine whether the testis should be considered an intraperitoneal or an extraperitoneal organ. The anatomical and embryological literature relevant to human and animal models was reviewed. Direct dissections were made in rats (n=8) during foetal development, postnatally, and in mature animals, allowing comparison of foetus with adult and male with female. The position of the human testis was also recorded in various pathological states. Direct dissection in rats reveals an intraperitoneal testis on a mesorchium during both foetal and postnatal life. Intraperitoneal testes are demonstrated in humans in cases of gastroschisis (where the testis may protrude through the periumbilical defect with the bowel), testicular torsion (where the testis is mobile within the peritoneum), and bell clapper testis (where the testes are identifiable as intraperitoneal). We conclude that the foetal testis is an intraperitoneal organ. In the adult rat the testis remains intraperitoneal. The postnatal human testis is intraperitoneal. The adult human testis is intraperitoneal but may appear extraperitoneal. The apparent discrepancy between the adult testis being intraperitoneal or extraperitoneal is likely to result from differences in the relative size of the tunica vaginalis between infant boys and elderly men.

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Authors and Affiliations

  1. F. Douglas Stephens Surgical Research Laboratory, Murdoch Children’s Research Institute, Department of Paediatrics, University of Melbourne, Melbourne, Australia

    Su B. T. Pham, Matthew K.-H. Hong, Julie A. Teague & John M. Hutson

  2. General Surgery, Royal Children’s Hospital, Parkville, Australia

    John M. Hutson

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  1. Su B. T. Pham
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  2. Matthew K.-H. Hong
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  3. Julie A. Teague
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  4. John M. Hutson
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Correspondence to John M. Hutson.

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Pham, S.B.T., Hong, M.KH., Teague, J.A. et al. Is the testis intraperitoneal?. Ped Surgery Int 21, 231–239 (2005). https://doi.org/10.1007/s00383-005-1364-2

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