Which muscle compresses the bulb of the penis?

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Multiple Choice

Which muscle compresses the bulb of the penis?

Explanation:
Bulbospongiosus directly surrounds and compresses the bulb of the penis (the expanded proximal part of the corpus spongiosum). Its contraction squeezes the bulb and the urethra, helping to expel residual urine and semen and to increase pressure within the penile erectile tissues, which aids ejaculation and supports erection. The ischiocavernosus surrounds the crura and helps maintain erection by compressing venous channels draining the erectile tissue, but it does not compress the bulb itself. The superficial transverse perineal and external anal sphincter have other roles in stabilizing the perineal floor and maintaining continence, respectively, with no direct effect on the bulb.

Bulbospongiosus directly surrounds and compresses the bulb of the penis (the expanded proximal part of the corpus spongiosum). Its contraction squeezes the bulb and the urethra, helping to expel residual urine and semen and to increase pressure within the penile erectile tissues, which aids ejaculation and supports erection. The ischiocavernosus surrounds the crura and helps maintain erection by compressing venous channels draining the erectile tissue, but it does not compress the bulb itself. The superficial transverse perineal and external anal sphincter have other roles in stabilizing the perineal floor and maintaining continence, respectively, with no direct effect on the bulb.

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