Micturition in Medicine: Nerve Supply and Reflexes

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Which autonomic nerve supply is responsible for contraction of the detrusor muscle and emptying of the bladder?

Sympathetic innervation from T11-L2

Parasympathetic innervation from S2, S3, S4 (correct)

Sympathetic innervation from S2, S3, S4

Somatic motor innervation from the pudendal nerve

Which autonomic nerve supply is involved in preventing sperm reflux during ejaculation?

Somatic motor innervation from the pudendal nerve

Sympathetic innervation from S2, S3, S4

Sympathetic innervation from T11-L2 (correct)

Parasympathetic innervation from S2, S3, S4

Which nerve supplies the external sphincter of the bladder, making it voluntary?

Dorsal column nerve

Parasympathetic nerve

Sympathetic nerve

Pudendal nerve (correct)

Where does the sensation of bladder distension originate in the spinal cord?

Posterior column (fasciculus gracilis) Signup and view all the answers

Which nerve is responsible for urethral sensations?

Pudendal nerve Signup and view all the answers

What triggers the micturition reflex?

Filling of bladder by 300–400 mL of urine Signup and view all the answers

Which nerve is responsible for transmitting afferents from the stretch receptors in the detrusor muscle and urethra?

Pelvic splanchnic nerves Signup and view all the answers

Which segment of the spinal cord do the afferents from the stretch receptors enter to reach the sacral micturition center?

S2, S3, S4 Signup and view all the answers

What is the function of efferents from the sacral detrusor nucleus?

excitotry to the detrusor muscle Signup and view all the answers

What happens once the micturition reflex becomes powerful enough?

Inhibition of external sphincter Signup and view all the answers

Where are the influence of higher centers mainly located in relation to micturition?

Pons and certain areas of cerebral cortex Signup and view all the answers

Micturition in Medicine: Nerve Supply and Reflexes

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Questions and Answers

Which autonomic nerve supply is responsible for contraction of the detrusor muscle and emptying of the bladder?

Which autonomic nerve supply is involved in preventing sperm reflux during ejaculation?

Which nerve supplies the external sphincter of the bladder, making it voluntary?

Where does the sensation of bladder distension originate in the spinal cord?

Which nerve is responsible for urethral sensations?

What triggers the micturition reflex?

Which nerve is responsible for transmitting afferents from the stretch receptors in the detrusor muscle and urethra?

Which segment of the spinal cord do the afferents from the stretch receptors enter to reach the sacral micturition center?

What is the function of efferents from the sacral detrusor nucleus?

What happens once the micturition reflex becomes powerful enough?

Where are the influence of higher centers mainly located in relation to micturition?

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