Sex Differences
Despite common misconceptions, human males do not have stronger urethral sphincter muscles than females, nor are there any noticeable capacity differences in the bladders. Anatomically, females have to urinate more frequently because their bladders share space with the uterus and vagina in the anterior wall. In males and females, this muscle functions to prevent the release of urine. In males, the internal sphincter muscle of urethra functions to prevent reflux of seminal fluids into the male bladder during ejaculation. In males the bladder does not share space with any reproductive organs.
Females do have a more elaborate external sphincter muscle than males as it is made up of three parts, the sphincter urethrae, urethrovaginal muscle, and the compressor urethrae. The urethrovaginal muscle fibers wrap around the vagina and urethra and contraction leads to constriction of both the vagina and the urethra. The origin of the compressor urethrae muscle is the right and left inferior pubic ramus and it wraps anteriorly around the urethra so when it contracts it squeezes the urethra against the vagina. The external urethrae, like in males, wraps solely around the urethra.
Read more about this topic: Urethral Sphincter
Famous quotes containing the word differences:
“The extent to which a parent is able to see a child’s world through that child’s eyes depends very much on the parent’s ability to appreciate the differences between herself and her child and to respect those differences. Your own children need you to accept them for who they are, not who you would like them to be.”
—Lawrence Balter (20th century)