Penis

Penis
Penis
	Penis of an Asian elephant
Details
Precursor	Genital tubercle (amniotes)
System	Reproductive system, sometimes with the genitourinary system
Identifiers
Latin	penis
	Anatomical terminology

A penis (/ˈpiːnɪs/; pl.: penises or penes) is a sex organ through which male and hermaphrodite animals expel semen,^[1]^[2] and through which male placental mammals and marsupials also urinate.^[3]^[4] This organ is used during copulation in many vertebrate and invertebrate species, but not all.^[5]

The term penis applies to many intromittent organs, but not to all. As an example, the intromittent organ of most Cephalopoda is the hectocotylus, a specialized arm, and male spiders use their pedipalps. Even within the Vertebrata, there are morphological variants with specific terminology, such as hemipenes.

^ Janet Leonard; Alex Cordoba-Aguilar R (18 June 2010). The Evolution of Primary Sexual Characters in Animals. Oxford University Press. ISBN 978-0-19-971703-3. Archived from the original on 11 October 2013. Retrieved 20 July 2013.
^ Schmitt, V.; Anthes, N.; Michiels, N. K. (2007). "Mating behaviour in the sea slug Elysia timida (Opisthobranchia, Sacoglossa): hypodermic injection, sperm transfer and balanced reciprocity". Frontiers in Zoology. 4: 17. doi:10.1186/1742-9994-4-17. ISSN 1742-9994. PMC 1934903. PMID 17610714.
^ Cite error: The named reference Wake1992 was invoked but never defined (see the help page).
^ Cite error: The named reference :1 was invoked but never defined (see the help page).
^ Hosken, David J.; Archer, C. Ruth; House, Clarissa M.; Wedell, Nina (2019). "Penis evolution across species: divergence and diversity". Nature Reviews Urology. 16 (2): 98–106. doi:10.1038/s41585-018-0112-z. hdl:10871/34696.