urethral sphincter การใช้

• The external urethral sphincter is a striated muscle that allows voluntary control over urination.
• Branches also innervate muscles of the perineum and pelvic floor; namely the female external urethral sphincter.
• This area controls the everyday function of the pelvic floor, urethral sphincter, bladder and bowel.
• Another possibility is the use of transplanted stem cells that may differentiate and regenerate the urethral sphincter.
• The external urethral sphincter ( sphincter urethrae ) is under somatic control and is consciously relaxed during micturition.
• Related are the urethral sphincter muscles which envelop the urethra to control the flow of urine when they contract.
• He also invented a hydraulic operating table and a rotatable resectoscope, and described the first artificial urethral sphincter.
• The external urethral sphincter originates at the ischiopubic ramus and inserts into the intermeshing muscle fibers from the other side.
• As it functions to innervate the external urethral sphincter it is responsible for the tone of the sphincter mediated via acetylcholine release.
• This means that during periods of increased acetylcholine release the skeletal muscle in the external urethral sphincter contracts, causing urinary retention.
• Further along the urethra is a sphincter of skeletal muscle, the sphincter of the membranous urethra ( external urethral sphincter ).
• The muscles controlling micturition are controlled by the parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax.
• The urethral sphincters and its smooth muscle, as well as the neck of the bladder, can be injured regardless of the surgical approach.
• Finally the somatic nerve supply arises from the urethral sphincter motor neurons in the ventral horn of the sacral spinal cord; better known as Onuf s nucleus.
• Smooth muscle bundles pass on either side of the urethra, and these fibers are sometimes called the internal urethral sphincter, although they do not encircle the urethra.
• Between the superior and inferior fascia of the urogenital diaphragm, the female urethra is surrounded by the urethral sphincter . external urethral sphincter is supplied by the pudendal nerve.
• Between the superior and inferior fascia of the urogenital diaphragm, the female urethra is surrounded by the urethral sphincter . external urethral sphincter is supplied by the pudendal nerve.
• It carries sensation from the external genitalia of both sexes and the skin around the anus and perineum, as well the female external urethral sphincter and the external anal sphincter.
• As mentioned before, the motoneurons of the external urethral sphincter and the external anal sphincter are found in ventral horn of the second sacral segment known as Onuf s nucleus.
• The muscle is a part of the external urethral sphincter that continues superiorly as a trough-like extension running vertically across the anterior aspect of the prostate to reach the neck of the bladder.