retractor penis inserts at the boundary between the penis and epiphallus.
2.
In Tandonia, the retractor penis inserts at the boundary between the penis and epiphallus.
3.
Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure.
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.
5.
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.
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