The bulb is the expanded rear end of the corpus spongiosum, attached to the perineal membrane in the midline. The spongy urethra enters it from above, and it is covered by the bulbospongiosus muscle.
| Location | Superficial perineal pouch, midline, below the perineal membrane |
|---|---|
| Parts |
|
| Nerve Supply | Cavernous nerves; Pudendal nerve (bulbospongiosus) |
| Blood Supply | Artery of the bulb of the penis (internal pudendal artery) |
| Venous drainage |
|
| Lymphatic drainage |
|
Anchors the corpus spongiosum and helps expel urine and semen through contraction of bulbospongiosus.
The bulbar urethra running through it is the commonest site of urethral injury in straddle falls. Radiation dose to the bulb is limited in prostate radiotherapy to reduce erectile dysfunction.
Crushing of the urethra against the pubic bone in a straddle fall.
Scarring of the bulbar urethra causing a weak, spraying stream.
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