Knowra Penis Penis The penis is an external organ of the male reproductive system. In humans, it contains the urethra and erectile tissue and serves urinary and sexual functions.
Corpora cavernosa : Two columns of erectile tissue in the penis that fill with blood during erection. These paired chambers provide most penile rigidity during erection.
Erection : A physiological state in which erectile tissue becomes enlarged and firm, usually through increased blood flow. It is the vascular change that makes the penis firm for sexual activity.
Erectile dysfunction : Persistent difficulty achieving or maintaining an erection sufficient for sexual activity. It is a common condition involving the penis’s vascular, neurological, or hormonal function.
Clitoris : An erectile organ of the vulva with extensive sensory innervation and developmental homology to the penis. Both organs develop from related embryonic tissue but have different anatomy and typical functions.
Phallic symbol : An image, object, or form interpreted as representing the penis or masculine sexual power. Penile form has become a recurring symbol in art, ritual, and political interpretation.
Corpus spongiosum : A column of erectile tissue surrounding the penile urethra and expanding at the glans. It keeps the urethra from being compressed during erection.
Nitric oxide : A signaling molecule that relaxes smooth muscle and widens blood vessels in many tissues. Nerve-released nitric oxide helps increase penile blood flow during erection.
Phimosis : A condition in which the foreskin cannot be retracted over the glans. Restricted foreskin movement can affect hygiene, comfort, or urination.
Vulva : The external genital structures surrounding the openings of the urinary and reproductive tracts in many female mammals. It is the corresponding external genital region, with a different organization and reproductive role.
Circumcision : The surgical removal of some or all of the foreskin from the penis. The practice carries religious, cultural, and medical meanings beyond its anatomical effects.
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