This site uses cookies. By continuing, your consent is assumed. Learn more

96.4fm shares

Men peeing inside women

opinion
xXx Pics Men peeing inside women.

Urination is the release of urine from the urinary bladder through the urethra to the outside of the body. It is the urinary system 's form of excretion. It is also known medically as micturitionvoidinguresisor, rarely, emictionand Men peeing inside women colloquially by various names including peeingweeingand pissing. In healthy humans and many other animals the process of urination is under voluntary control.

In Men peeing inside women, some elderly individuals, and those with neurological injury, urination may occur as a reflex. It is normal for adult humans to urinate up to seven times during the day.

In some animals, in addition to expelling waste material, urination can mark territory or express submissiveness. Physiologically, urination involves coordination between the centralautonomicand somatic nervous systems. Brain centers that regulate urination include the pontine micturition centerperiaqueductal grayand the cerebral cortex.

In placental mammalsurine is drained through the urinary meatusa urethral opening in the male penis or female vulval vestibule. The Men peeing inside women organs involved Men peeing inside women urination are the urinary bladder and the urethra.

Cleveland Clinic Menu

The smooth muscle of the bladder, known as the detrusoris innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord. Part of the urethra is surrounded Men peeing inside women the male or female external urethral sphincterwhich is innervated by the somatic pudendal nerve originating in the cord, in an area termed Onuf's nucleus.

Smooth muscle bundles pass on either side of the urethra, and these fibers are sometimes called the internal urethral sphincteralthough they do not encircle the urethra.

Further along the urethra is a sphincter of skeletal muscle, the sphincter of the membranous urethra external urethral sphincter.

Big booty shaved pussy

The bladder's epithelium is termed transitional epithelium which contains a superficial layer of dome-like cells and multiple layers of stratified cuboidal cells underneath when evacuated. When the bladder is fully distended the superficial cells become squamous flat and the stratification of the cuboidal cells is reduced in order to provide lateral stretching. The physiology of micturition and the physiologic basis of its disorders are subjects about which there is much confusion, especially at the supraspinal level.

Micturition is fundamentally a spinobulbospinal reflex facilitated and inhibited by higher brain centers Men peeing inside women as the pontine micturition center and, like defecationsubject to voluntary Men peeing inside women and inhibition.

In healthy individuals, the lower urinary tract has two discrete phases of activity: The state of the reflex system is dependent on both a conscious signal from the brain and the firing rate of sensory fibers from the bladder and urethra. When the individual is ready to urinate, he or she consciously initiates voiding, causing the bladder to contract and the outlet to relax. Voiding continues until the bladder empties completely, at which point the bladder relaxes and the outlet contracts to re-initiate storage.

During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. During micturition, parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax.

The external urethral sphincter sphincter urethrae is under somatic control and is consciously relaxed during micturition. In infants, voiding occurs involuntarily as a reflex. The ability to voluntarily inhibit micturition develops by the age of 2—3 years, as control at higher levels of the central nervous system develops. During storage, bladder pressure stays low, because of the bladder's highly compliant nature.

A plot of bladder intravesical pressure against the depressant of fluid in the bladder called a cystometrogramwill show a very slight rise as the bladder is filled. This phenomenon is a manifestation of the law of Laplacewhich states that the pressure in a spherical viscus is equal to twice the wall tension divided by the radius. In the case of the bladder, the tension increases as the organ fills, but so does the radius.

Therefore, the pressure increase is slight until the organ is relatively full. 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. Action potentials carried by sensory neurons from stretch receptors in the urinary bladder wall travel to Men peeing inside women sacral segments of the spinal cord Men peeing inside women the pelvic nerves.

Low-frequency afferent signals cause relaxation of the bladder by inhibiting sacral parasympathetic preganglionic neurons and exciting lumbar sympathetic preganglionic neurons. Conversely, afferent input causes contraction of the sphincter through excitation of Onuf's nucleus, and contraction of the Men peeing inside women neck and urethra through excitation of the sympathetic preganglionic neurons.

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. Voiding begins when a voluntary signal is sent from the brain to begin urination, and continues until the bladder is empty.

Men peeing inside women

Sexy randi movie

Bladder afferent signals ascend the spinal cord to the periaqueductal graywhere they project both to the pontine micturition center and to the cerebrum. Once the voluntary signal to begin voiding has been issued, neurons in pontine micturition center fire maximally, causing excitation of Men peeing inside women preganglionic neurons. 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 pontine micturition center also causes inhibition of Onuf's nucleus, resulting in relaxation of the external urinary sphincter. The micturition reflex normally produces a series of contractions of the urinary bladder. The flow of urine through the urethra has an overall excitatory role in micturition, which helps sustain voiding until the bladder is empty.

After urination, the female urethra empties partially by gravity, with assistance from muscles. Men peeing inside women 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. The mechanism by which voluntary urination is initiated remains unsettled.


YOU ARE HERE:
News feed