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    During micturition, parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax. In females the need to urinate is felt in the lower abdomen region when the bladder is full. Denervation When the afferent and efferent nerves are both destroyed, as they may be by tumors of the cauda equina or filum terminale , the bladder is flaccid and distended for a while. The reflex hyperactivity is made worse, and may be caused, by infection in the bladder wall. The bladder can be made to contract by voluntary facilitation of the spinal voiding reflex when it contains only a few milliliters of urine. The bladder's smooth muscle has some inherent contractile activity; however, when its nerve supply is intact, stretch receptors in the bladder wall initiate a reflex contraction that has a lower threshold than the inherent contractile response of the muscle. The external sphincter can be contracted voluntarily, which will prevent urine from passing down the urethra.

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    This type of bladder is sometimes called the spastic neurogenic bladder. After transection of the brain stem just above the pons, the threshold is lowered and less bladder filling is required to trigger it, whereas after transection at the top of the midbrain, the threshold for the reflex is essentially normal. The firing of these neurons causes the wall of the bladder to contract; as a result, a sudden, sharp rise in intravesical pressure occurs. The smooth muscle of the bladder, known as the detrusor , is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord. Micturition is fundamentally a spinobulbospinal reflex facilitated and inhibited by higher brain centers such as the pontine micturition center and, like defecation , subject to voluntary facilitation and inhibition. Voiding can also be consciously interrupted once it has begun, through a contraction of the perineal muscles. However, stimulation experiments in animals indicate that other cortical areas also affect the process. Deafferentation When the sacral dorsal roots are cut in experimental animals or interrupted by diseases of the dorsal roots such as tabes dorsalis in humans, all reflex contractions of the bladder are abolished. For smaller mammals a different phenomenon occurs, where urine is discharged as droplets, and urination in smaller mammals, such as mice and rats, can occur in less than a second. Storage phase During storage, bladder pressure stays low, because of the bladder's highly compliant nature. The external sphincter can be contracted voluntarily, which will prevent urine from passing down the urethra. However, the practice of elimination communication suggests otherwise. Diuresis production of urine by the kidney occurs constantly, and as the bladder becomes full, afferent firing increases, yet the micturition reflex can be voluntarily inhibited until it is appropriate to begin voiding. Physiology The physiology of micturition and the physiologic basis of its disorders are subjects about which there is much confusion, especially at the supraspinal level. Therefore, the pressure increase is slight until the organ is relatively full. Voiding phase Urinating woman Urinating man Voiding begins when a voluntary signal is sent from the brain to begin urination, and continues until the bladder is empty. Further along the urethra is a sphincter of skeletal muscle, the sphincter of the membranous urethra external urethral sphincter. In the case of the bladder, the tension increases as the organ fills, but so does the radius. During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. After spinal shock has passed, a spinally mediated voiding reflex ensues, although there is no voluntary control and no inhibition or facilitation from higher centers. During micturition, parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax. This phenomenon is a manifestation of the law of Laplace , which states that the pressure in a spherical viscus is equal to twice the wall tension divided by the radius. Please help improve this section by adding citations to reliable sources. In females the need to urinate is felt in the lower abdomen region when the bladder is full. Gradually, however, the muscle of the "decentralized bladder" becomes active, with many contraction waves that expel dribbles of urine out of the urethra. Once the voluntary signal to begin voiding has been issued, neurons in pontine micturition center fire maximally, causing excitation of sacral preganglionic neurons. It is commonly believed that in infants, voiding occurs involuntarily as a reflex.

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    4 Comments on “Adult sex video peeing”

    • Zoloran

      Storage phase During storage, bladder pressure stays low, because of the bladder's highly compliant nature.

    • Tunris

      During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. The micturition reflex normally produces a series of contractions of the urinary bladder.

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