Penis Penis

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A bone called the baculum or os penis is present in most mammals but absent in humans and horses.
Domesticated mammals
In domestic animals the penis is divided into three parts:[4]
  * Roots (crura): these begin at the caudal border of the pelvic ischial arc.
  * Body: the part of the penis extending from the roots.
  * Glans: the free end of the penis.
The internal structures of the penis consist mainly of cavernous (erectile) tissue, which is a collection of blood sinusoids separated by sheets of connective tissue (trabeculae). Some animals have a lot of erectile tissue relative to connective tissue, for example horses. Because of this a horse's penis can enlarge more than a bull's penis. The urethra is on the ventral side of the body of the penis.
Stallions have a vascular penis. When non-erect, it is quite flaccid and contained within the prepuce (sheath). The retractor penis muscle is relatively... [continues]

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