Penis
Penis | |
---|---|
Details | |
Precursor | Genital tubercle (amniotes) |
System | Reproductive system, sometimes with the genitourinary system |
Identifiers | |
Latin | penis |
Anatomical terminology |
In many
The term penis applies to many
Etymology
The word "penis" is taken from the
As with nearly any aspect of the body involved in sexual or
The Latin word "phallus" (from Greek φαλλος) is sometimes used to describe the penis, although "phallus" originally was used to describe representations, pictorial or carved, of the penis.[5]
Evolution and function
The external genital organs appeared in the Devonian, about 410 million years ago, when tetrapods began to abandon the aquatic environment.[6] In fact, it was necessary to overcome the absence of a liquid phase in which to release the gametes was achieved through the transition to internal fertilization.
Among amniotes, the development of an erectile penis occurred independently for
Over time, birds have lost this organ, with the exception of
The penis is an
An
The last common ancestor of all living amniotes (mammals, birds and reptiles) likely possessed a penis.[9]
Vertebrates
Birds
Most male birds (e.g.,
Mammals
-
Penis of a hamadryas baboon
-
Penis of a horse
-
Penis of a cat
-
Penis of a dog (Great Dane)
As with any other bodily attribute, the length and girth of the penis can be highly variable between
A bone called the baculum is present in most placental mammals but absent in humans, cattle and horses.
In mammals, the penis is divided into three parts:[16]
- Roots (caudal border of the pelvic ischial arch.
- 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,
Fish and reptiles
Male
In some fish, the
Invertebrates
In male insects, the structure analogous to a penis is known as aedeagus. The male copulatory organ of various lower invertebrate animals is often called the cirrus.[25]
In 2010, entomologist Charles Linehard described Neotrogla, a new genus of barkflies. Species of this genus have sex-reversed genitalia. Females have penis-like organs called gynosomes that are inserted into vagina-like openings of males during mating.[26]
Heraldry
Pizzles are represented in heraldry, where the adjective pizzled (or vilené[27]) indicates that part of an animate charge's anatomy, especially if coloured differently.
See also
References
Citations
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- ^ Gadow, H. On the systematic position of Notoryctes typhlops. Proc. Zool. Soc. London 1892, 361–370 (1892).
- ^ Riedelsheimer, B., Unterberger, P., Künzle, H. and U. Welsch. 2007. Histological study of the cloacal region and associated structures in the hedgehog tenrec Echinops telfairi. Mammalian Biology 72(6): 330-341.
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- ^ "Penis | Description, Anatomy, & Physiology | Britannica". Encyclopædia Britannica. January 2024.
- from the original on 2014-11-03.
- ^ Rietstap, J. B. (1884). "Armorial général; précédé d'un Dictionnaire des termes du blason". G. B. van Goor zonen: XXXI.
Vilené: se dit un animal qui a la marque du sexe d'un autre émail que le corps
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