Which action helps maintain erection by restricting venous outflow from the penis by compressing the deep dorsal vein tributaries?

Which action helps maintain erection by restricting venous outflow from the penis by compressing the deep dorsal vein tributaries?

• A. Ischiocavernosus
• B. Bulbospongiosus
• C. Superficial transverse perineal
• D. External anal sphincter

Answer: (A)

Maintaining an erection relies on keeping blood trapped in the penile erectile tissues by limiting venous drainage. The deep dorsal vein drains blood away from the corpora cavernosa. When the ischiocavernosus contracts, it compresses the crura of the penis and the deep dorsal vein tributaries, restricting venous outflow. This trapping of blood increases and sustains intracavernosal pressure, helping to keep the penis erect. The other muscles have roles related to stabilization or other functions, but they don’t target the deep dorsal vein tributaries to the same extent, so they’re less effective at preserving erection through venous constriction.

Maintaining an erection relies on keeping blood trapped in the penile erectile tissues by limiting venous drainage. The deep dorsal vein drains blood away from the corpora cavernosa. When the ischiocavernosus contracts, it compresses the crura of the penis and the deep dorsal vein tributaries, restricting venous outflow. This trapping of blood increases and sustains intracavernosal pressure, helping to keep the penis erect. The other muscles have roles related to stabilization or other functions, but they don’t target the deep dorsal vein tributaries to the same extent, so they’re less effective at preserving erection through venous constriction.