Retractor muscle of the penis

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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.[1]

In Tandonia, the retractor penis inserts at the boundary between the penis and epiphallus.[2]

In stallions, the retractor penis muscle is relatively underdeveloped.[3] The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath.[4]

In bulls, protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure.[3]


  1. ^ Rue III, Leonard Lee (2004-11-01). The Deer of North America. Globe Pequot. p. 312. ISBN 9781592284658. Retrieved 2 March 2013. 
  2. ^ PD-icon.svg "Genus summary for Tandonia". AnimalBase, last modified 23 May 2010, accessed 26 August 2010.
  3. ^ a b Sarkar, A. (2003). Sexual Behaviour In Animals. Discovery Publishing House. ISBN 978-81-7141-746-9. 
  4. ^ "The Stallion: Breeding Soundness Examination & Reproductive Anatomy". University of Wisconsin-Madison. Archived from the original on 2007-07-16. Retrieved 7 July 2007.