Library · Anatomy
Penis
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The penis is a male organ that serves two purposes: reproduction and urination. It has three parts: the glans or tip, the body, and the root.
Inside, the dorsal side is formed by the paired corpora cavernosa, and the ventral side by the corpus spongiosum, through which the urethra, the tube that carries urine, runs. The corpus cavernosum is wrapped by the tunica albuginea, which acts like a sheath.
Erection is driven by the parasympathetic nerves, part of the nervous system that works without you having to think about it: the corpora then fill and the erectile tissue of the corpus cavernosum becomes firm and increases in size.
In brief
The penis is a male organ used for reproduction and for urination, and it has three parts: the glans, the body, and the root.
On the dorsal side it is formed by the paired corpora cavernosa and on the ventral side by the corpus spongiosum, which contains the urethra; the tunica albuginea wraps around the corpus cavernosum.
Erection occurs through parasympathetic innervation, which allows the corpora to fill; the erectile tissue of the corpus cavernosum then becomes firm and increases in size.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingAnatomy, Abdomen and Pelvis, Penis, StatPearlsPublished
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