Origin
External urethral sphincter (male) – inferior pubic ramus, prostate gland.
External urethral sphincter (female) – inferior pubic ramus.
Internal urethral sphincter – Inferior pubic ramus.
Insertion
External urethral sphincter (male) – prostate gland, perineal body.
External urethral sphincter (male) – anterior vaginal wall.
Internal urethral sphincter – perineal raphe.
Blood supply
Internal pudendal artery.
Nerve supply
External sphincter – Pudendal nerve.
Internal sphincter – Lumbar splanchnic nerves, inferior hypogastric nerve.
Action
When the muscle contracts, the flow of urine stops.
Disease/Injury
In females, these muscles get damaged during childbirth, which results in urinary incontinence.
Muscle Exercise
Kegel’s exercise helps to strengthen this muscle, in which you practice contraction and relaxation of the pelvic floor muscles.
