bulbospongiosus muscle

Urine remaining in the urethra of the male is expelled by several contractions of the bulbospongiosus muscle.

In contrast to the development of muscle and joint strength, IGF-1 has been seen to decrease to the Bulbospongiosus muscle in males.

The ischiocavernosus and bulbospongiosus muscles also compress the veins of the corpora cavernosa, limiting the venous drainage of blood.

They are generated by the bulbospongiosus muscle under the control of a spinal reflex at the level of the spinal nerves S2-4 via the pudendal nerve.

It involves closure of bladder neck, followed by the rhythmic contractions of the urethra by pelvic-perineal and bulbospongiosus muscle, and intermittent relaxation of external urethral sphincters.