How is micturition controlled?

How is micturition controlled?

The muscles controlling micturition are controlled by the autonomic and somatic nervous systems, which open the two sphincters during the voiding phase of micturition. During the storage phase the internal urethral sphincter is tense and the detrusor muscle is relaxed by sympathetic stimulation.

Is micturition voluntary or involuntary?

In addition, micturition is under voluntary control and depends on learned behaviour that develops during maturation of the nervous system, whereas many other visceral functions are regulated involuntarily.

What are the involuntary muscle actions of micturition?

When the bladder is full of urine, stretch receptors in the bladder wall trigger the micturition reflex. The detrusor muscle that surrounds the bladder contracts. The internal urethral sphincter relaxes, allowing for urine to pass out of the bladder into the urethra. Both of these reactions are involuntary.

How does micturition work quizlet?

How does the micturition reflex work? accumulating urine stretches bladder and activates sensory stretch receptors sends signal via pelvic nerves to spinal cord, reflex response comes back via PS nerves causes reflexive contraction of detrusor muscle. The detrusor spontaneously relaxes at low volume.

What brain part controls micturition?

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.

Which nerve is responsible for micturition?

Parasympathetic (pudendal nerve): Parasympathetic postganglionic nerve terminals release acetylcholine (ACh), which can excite various muscarinic receptors in bladder smooth muscles, leading to bladder contractions.

What is micturition and what controls it quizlet?

Definition of micturition. The process of filling the bladder until it reaches a threshold level at which the autonomic micturition reflex results in emptying of the bladder, or if it fails, the conscious desire to urinate. Smooth muscle that lines the bladder. Detrusor Muscle.

What does the word micturition mean?

Urination
Micturition: Urination; the act of urinating.

What triggers the process of micturition?

Micturition, or urination, is the act of emptying the bladder. When the bladder is full of urine, stretch receptors in the bladder wall trigger the micturition reflex. The detrusor muscle that surrounds the bladder contracts.

Which part of the brain controls micturition?

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.

Which part of the brain controls micturition reflex?

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.