The corpus spongiosum is the single column of erectile tissue that runs along the underside of the penis and surrounds the spongy urethra. It starts at the back as the expanded bulb of the penis, covered by bulbospongiosus, and ends at the front by flaring into the glans. Its tunica albuginea is thinner than that of the corpora cavernosa.
| Location | Ventral part of the penis, from the bulb in the superficial perineal pouch to the glans |
|---|---|
| Parts |
|
| Nerve Supply | Cavernous nerves; Perineal branches of the pudendal nerve |
| Blood Supply | Artery of the bulb of the penis; Urethral artery; Dorsal artery of the penis |
| Venous drainage |
|
| Lymphatic drainage |
|
Carries and protects the spongy urethra and forms the glans, filling softly in erection so the urethra remains open.
Because it fills less firmly during erection, the urethra inside it stays open so semen can pass. The bulb is the part injured in straddle falls, along with the urethra. Scarring around the urethra in the spongiosum (spongiofibrosis) underlies most anterior urethral strictures.
Scarring of the corpus spongiosum around the urethra, causing urethral stricture.
Crushing of the bulb and urethra against the pubic arch from a fall astride an object.
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