Penile sheath

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Penile sheath of a Great Dane Great Dane sheath.jpg
Penile sheath of a Great Dane

Almost all mammal penises have foreskins or prepuces. [1] In non-human mammals, the prepuce is sometimes called the penile sheath [2] or preputial sheath. [3]

Contents

In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. [4] In some bat species, the prepuce contains an erectile tissue structure called the accessory corpus cavernosum. [5]

During musth, a male elephant may urinate with the penis still in the sheath, which causes the urine to spray on the hind legs. [6]

Male dogs and wild dogs have a large and conspicuous penile sheath. [7]

Penile sheath of a Chihuahua with cryptorchidism Inguinal cryptorchid 1.JPG
Penile sheath of a Chihuahua with cryptorchidism

In stallions, the retractor penis muscle contracts to retract the stallion's penis into the sheath and relaxes to allow the penis to extend from the sheath. [8]

The penile sheath of a male axis deer is elongated and urine-stained. When rubbing trees with their horns, these stags sometimes move the penis back and forth rapidly inside its sheath. [9] Male bison and fallow deer have tufts of fur at the end of their penile sheaths. [10]

In rodents, the length of the prepuce is related to urine marking behavior. [11]

See also

References

  1. Fahmy, Mohamed A. Baky. "Prepuce." Rare Congenital Genitourinary Anomalies. Springer Berlin Heidelberg, 2015. 33-41.
  2. The behavior guide to African mammals: including hoofed mammals, carnivores, primates . University of California Press. 1991. pp.  116–. ISBN   978-0-520-08085-0 . Retrieved 25 April 2013. penile sheath OR penis sheath OR prepuce.
  3. Edward C. Feldman (2004). Canine and feline endocrinology and reproduction. Elsevier Health Sciences. pp. 934–. ISBN   978-0-7216-9315-6. Archived from the original on 31 December 2013. Retrieved 25 April 2013.
  4. "UQ researchers unlock another koala secret". Uq.edu.au. 2001-05-09. Archived from the original on 2013-05-12. Retrieved 2012-07-16.
  5. Elizabeth G. Crichton; Philip H. Krutzsch (12 June 2000). Reproductive Biology of Bats. Academic Press. pp. 104–. ISBN   978-0-08-054053-5.
  6. Sukumar, pp. 100–08.
  7. George B. Schaller (15 October 2009). The Serengeti Lion: A Study of Predator-Prey Relations. University of Chicago Press. pp. 329–. ISBN   978-0-226-73660-0. Archived from the original on 28 May 2013. Retrieved 10 February 2013.
  8. "The Stallion: Breeding Soundness Examination & Reproductive Anatomy". University of Wisconsin-Madison. Archived from the original on 2007-07-16. Retrieved 7 July 2007.
  9. Valerius Geist (1998). Deer of the World: Their Evolution, Behaviour and Ecology. Stackpole Books. ISBN   978-0-8117-0496-0. Archived from the original on 23 June 2016. Retrieved 11 May 2013.
  10. Fiona Reid (15 November 2006). Peterson Field Guide to Mammals of North America: Fourth Edition. Houghton Mifflin Harcourt. ISBN   978-0-547-34553-6. Archived from the original on 23 June 2016. Retrieved 11 May 2013.
  11. Maruniak, J. A., Claude Desjardins, and F. H. Bronson. "Adaptations for urinary marking in rodents: Prepuce length and morphology Archived 2018-07-20 at the Wayback Machine ." Journal of Reproduction and Fertility 44.3 (1975): 567-570.

Further reading