Voluntary micturition

safaTerkawi

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2022-08-11

Voluntary micturition.

Depends on the integrity of a lumbar spinal reflex arc.
Is not possible after sensory denervation of the bladder.
Involves stimulation of the detrusor muscle in the bladder by autonomic sympathetic nerves.
Is normally accompanied by some reflux of bladder contents into the ureters.
Is inhibited during ejaculation.

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safaTerkawi

2022-08-11

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A. False The reflex centres are in the sacral cord; their activity is modulated by higher centres.

B. True This breaks the reflex arc.

C. False Parasympathetic nerves are motor to the detrusor muscle.

D. False Valves where the ureters enter the bladder do not allow such reflux.

E. True During ejaculation, sympathetic activity constricts the bladder neck sphincter and prevents retrograde ejaculation of semen into the bladder.

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