What is the voiding reflex?
The micturition reflex involves a coordinated and sustained contraction of the detrusor muscle (the detrusor reflex) along with simultaneous relaxation of the urethra. As the detrusor muscle contracts, the urethra relaxes, allowing urine to pass.
What are the steps of micturition reflex?
Normal urination (micturition) occurs in the following stages:
- Urine is made in the kidneys.
- Urine is stored in the bladder.
- The sphincter muscles relax.
- The bladder muscle (detrusor) contracts.
- The bladder is emptied through the urethra and urine is removed from the body.
What are the two reflexes that control urination?
The micturition reflex is a bladder-to-bladder contraction reflex for which the reflex center is located in the rostral pontine tegmentum (pontine micturition center: PMC). There are two afferent pathways from the bladder to the brain. One is the dorsal system and the other is the spinothalamic tract.
Which part of the brain controls the urination reflex?
pons
The pons is a major relay center between the brain and the bladder. The mechanical process of urination is coordinated by the pons in the area known as the pontine micturition center (PMC). The conscious sensations associated with bladder activity are transmitted to the pons from the cerebral cortex.
What happens during voiding?
During micturition, urinary flow is assisted by additional detrusor contractions and external sphincter relaxation which further lowers resistance to the passage of urine. The abdominal wall and pelvic floor musculature also participates by increasing the force on the bladder to help achieve complete emptying.
Which part of the brain controls the micturition urination reflex?
The pons is a major relay center between the brain and the bladder. The mechanical process of urination is coordinated by the pons in the area known as the pontine micturition center (PMC).
Which nervous system controls urination?
The sympathetic nervous system regulates the process of urine storage in the bladder. In contrast, the parasympathetic nervous system controls bladder contractions and the passage of urine. The somatic efferent system permits voluntary control over the external periurethral sphincter.
What nerve controls micturition?
Autonomic Nervous System: Central Urogenital Control☆ Micturition is mediated by activation of the sacral parasympathetic efferent pathway to the bladder and the urethra, as well as by reciprocal inhibition of the somatic pathway to the urethral sphincter (Table 1; Fig.
What hormone regulates urination?
Antidiuretic hormone (ADH)
Antidiuretic hormone (ADH) is a chemical produced in the brain that causes the kidneys to release less water, decreasing the amount of urine produced. A high ADH level causes the body to produce less urine. A low level results in greater urine production.
Why is urination called pee?
As a verb meaning to urinate, “pee” is simply a shorter form of “piss.” It originally developed in the 18th century, when it stood for “the initial letter of piss,” according to the Oxford English Dictionary.