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Level 56

CVRR 56 Micturition


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400ml
The normal capacity of the bladder, in ml, before there is an urge to urinate
1000ml
The normal maximum capacity of the bladder, in ml
1.5L
The normal amount of urine voided in a day, in L
Ureters
Tubes made of smooth muscle fibres that propel urine from the kidneys to the bladder
Detrusor
The name given to the smooth muscle of the bladder
Pontine micturition centre
The main area of the brain involved in micturition
Incontinence and retention
Two important outcomes of problems with micturition
Benign prostate hyperplasia and urinary tract infections
Two conditions that may cause problems with micturition
Deafferentation
A type of neuropathy where the afferent pathway is lost
Denervation
A type of neuropathy where both the afferent and efferent pathway is lost
Syphilis
A condition that might cause deafferentation in the organs of micturition
Pelvic nerves, sacral arc, brainstem and frontal lobe
The nerves involved in micturition
S2, S3 and S4
The spinal segments involved in micturition
Skeletal
The external sphincter of the urethra is made of [______] muscle
Voluntary
The external sphincter muscle of the urethra is under [______] control
Smooth
The internal sphincter of the urethra is made of [______] muscle
Involuntary
The internal sphincter muscle of the urethra is under [______] control