Corpus cavernosum

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The corpus cavernosum penis (or corpus cavernosum urethrae) is one of two sponge-like sections of tissue in the male penis. They contain most of the blood during erection. The term literally means "cave-like body"

The corpus cavernosum are found along the length of the penis. They are located along the penis shaft, from the pubic bones to the head of the penis. The spongy tissue fills with blood. The blood comes from arteries down the length of the penis. The blood fills the corpora cavernosa. This causes it to swell. When swollen, it holds 90% of the blood involved in an erection. This increases both the length and diameter of the penis.

Blood can leave only through a system of veins around the outside wall of the corpus cavernosum. The expanding tissue constricts these veins. This preventing blood from leaving. The penis becomes rigid as a result.

Human reproductive system
Female anatomy	Cervix – Clitoris – Clitoral hood – Fallopian tubes – Bartholin's glands – Gräfenberg spot (G-spot) – Hymen – Labia – Mammary glands – Ovaries – Skene's glands – Urethra – Uterus – Vagina – Vulva
Female physiology	Ejaculation – Orgasm – Ovum
Male anatomy	Bulbourethral glands – Corpus cavernosum – Ejaculatory ducts – Epididymis – Foreskin – Frenulum – Glans penis – Penis – Prostate – Rete testis – Scrotum – Seminal vesicles – Seminiferous tubules – Sertoli cell – Spermatic cord – Testicles (testes) – Urethra – Vasa deferentia
Male physiology	Ejaculation – Erection – Orgasm – Semen – Sperm – Testosterone