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The male rabbit reproductive system (ventral view) with structures labeled. This image was taken during a specimen dissection at Pacific Lutheran University.
In an adult male rabbit, the sheath of the penis is cylinder-like and can be extruded as early as two months of age. [88] The scrotal sacs lay lateral to the penis and contain epididymal fat pads which protect the testes. Between 10 and 14 weeks, the testes descend and are able to retract into the pelvic cavity to thermoregulate. [88]
Many mammalian species have developed keratinized penile spines along the glans or shaft, which may be involved in sexual selection.These spines have been described as being simple, single-pointed structures or complex with two or three points per spine (strepsirrhines). [1]
This means that in the event of a rival male's sperm occupying the reproductive tract of a female, the human penis is able to displace the rival sperm, replacing it with his own. [42] Semen displacement has two main benefits for a male. Firstly, by displacing a rival male's sperm, the risk of the rival sperm fertilising the egg is reduced. [43]
A penis (/ ˈ p iː n ɪ s /; pl.: penises or penes) is a male sex organ that is used to inseminate female or hermaphrodite animals during copulation. [1] [2] Such organs occur in both vertebrates and invertebrates, including humans, but not in all male animals. [3] The term penis applies to many intromittent organs, but not to all.
Baculum of a dog's penis; the arrow shows the urethral sulcus, which is the groove in which the urethra lies. Fossil baculum of a bear from the Miocene. The baculum (pl.: bacula), also known as the penis bone, penile bone, os penis, os genitale, [1] or os priapi, [2] is a bone in the penis of many placental mammals.
In rabbits, the dewlap is a secondary sex characteristic of female rabbits which grows once the doe reaches sexual maturity. In laboratory conditions, when a butyl alcohol extract of the urine of pregnant women was administered to male rabbits, they developed a dewlap, which then gradually disappeared once the administration ceased.
The penis 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. [10] Male bison and fallow deer have tufts of fur at the end of their penis sheaths. [11] In rodents, the length of the prepuce is related to urine marking ...