Retractor muscle of the penis

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In some animals, the male penis possesses a muscle enabling retraction into the prepuce. [1]

In particular animals

The retractor penis muscle occurs in marsupials and carnivorans, but it is absent in humans. [2] A stag's penis forms an S-shaped curve when it is not erect, and is retracted into its preputial sheath by the retractor penis muscle. [3]

In Tandonia, the retractor penis inserts at the boundary between the penis and epiphallus. [4]

In stallions, the retractor penis muscle is relatively underdeveloped. [5] The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath. [6]

In bulls, protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure. [5]

References

  1. ↑ NICKEL (2013-11-11). The Viscera of the Domestic Mammals. Springer Science & Business Media. ISBN   978-1-4757-6814-5.
  2. ↑ Bassett, E. Gertrude. "Observations on the retractor clitoridis and retractor penis muscles of mammals with special reference to the ewe." Journal of anatomy 95.Pt 1 (1961): 61.
  3. ↑ Rue III, Leonard Lee (2004-11-01). The Deer of North America. Globe Pequot. p. 312. ISBN   9781592284658 . Retrieved 2 March 2013.
  4. ↑ PD-icon.svg "Genus summary for Tandonia". AnimalBase, last modified 23 May 2010, accessed 26 August 2010.
  5. 1 2 Sarkar, A. (2003). Sexual Behaviour In Animals. Discovery Publishing House. ISBN   978-81-7141-746-9.
  6. ↑ "The Stallion: Breeding Soundness Examination & Reproductive Anatomy". University of Wisconsin-Madison. Archived from the original on 2007-07-16. Retrieved 7 July 2007.
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