What muscle controls the external urethral sphincter?
A layer of muscle called the urogenital diaphragm supplies support for the contents of the pelvis and acts as the external urethral sphincter. It provides a second means of stopping the escape of urine from the body. This sphincter is under voluntary control.
What controls internal urethral sphincter?
It prevents urine leakage as the muscle is tonically contracted via sympathetic fibers traveling through the inferior hypogastric plexus and vesical nervous plexus. Specifically, it is controlled by the hypogastric nerve, predominantly via the alpha-1 receptor.
What muscles are used when urinating?
The internal urethral sphincter and the external urethral sphincter both provide muscle control for the flow of urine. The internal sphincter is involuntary. It surrounds the opening of the bladder to the urethra and relaxes to allow urine to pass.
What is the difference between urination and micturition?
micturition: Also known as urination, this is the ejection of urine from the urinary bladder through the urethra to the outside of the body. urine: A liquid excrement consisting of water, salts, and urea that is made in the kidneys then released through the urethra.
What muscles surround the urethra?
The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The two muscles are either the male or female external urethral sphincter and the internal urethral sphincter. When either of these muscles contracts, the urethra is sealed shut.
What has to happen to the external urethral sphincter to allow urination?
What has to happen to the external urethral sphincter to allow urination? The external urethral sphincter must be consciously relaxed to allow urination.
What muscles are involved in urination?
The internal urethral sphincter and the external urethral sphincter both provide muscle control for the flow of urine. The internal sphincter is involuntary. It surrounds the opening of the bladder to the urethra and relaxes to allow urine to pass. The external sphincter is voluntary.
Where is the muscle that controls urine flow?
The pelvic floor muscle [also known as the pubococcygeus (pu-bo-kak-sij-e- us) or PC muscle] supports your bladder and rectum and helps control your urine flow.
What type of muscle is the sphincter?
circular muscle
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals.