阴茎





消歧義  本文介绍的是雄性生殖器官。

  • 關於人的生殖器官，請見「人類陰莖」。

  • 關於其他被稱為陰莖或陽具的事物，請見「陰莖 (消歧義)」。






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亞洲象的阴茎（英语：elephant penis）.


阴茎一般用以表示雄性與雌雄間性動物的器官，在交配時將生殖细胞导入发情期的雌性生殖器。包括脊椎动物与无脊椎动物的许多物种具有此一器官，但未必同源。例如哺乳动物的陽具，与大多数种类的雄性昆虫或蔓脚類（日语：蔓脚類）（如跳蚤）的陽具并不相似（日语：相似 (生物学)）。有些动物的生殖交配器官则不用这个名称，例如多数头足纲的软体动物的交接腕（日语：交接腕）（一种觸手），而雄蜘蛛则用它们的觸枝。


在真獸亚綱的生理结构中，阴茎还内含有尿道局部的出口端，可在排尿时释出尿液，而在需要交配时释出精液。


另外,某些動物之䧳性同樣擁有假性陰莖，如非洲獵犬。



雄性外生殖器官


作為雄性的重要生殖器官，陰莖，可以勃起進行性交。對於哺乳動物來說，陰莖還是排泄器官。


很多有袋動物，除了兩種最大的袋鼠外，都有一個分叉的陰莖。也就是說，在陰莖的末端分成兩個柱狀物。


海豚可以自由控制它們的陰莖，一般用來感覺底部的物體。


藤壺是雌雄同体。相對於它們身長來說有最長的陰莖：長達它們體長的20倍。



參見


  • 人類的陰莖


參考資料








维基共享资源中相关的多媒体资源：阴茎







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