What is the dominant innervation of the Detrusor?

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Multiple Choice

What is the dominant innervation of the Detrusor?

Explanation:
During voiding, the detrusor smooth muscle is driven mainly by parasympathetic, cholinergic input. Nerves release acetylcholine, which acts on M3 muscarinic receptors on the detrusor to trigger contraction and you get bladder emptying. The sympathetic system, by contrast, mainly supports storage—relaxing the detrusor via β-adrenergic receptors and contracting the internal sphincter via α1 receptors—so it isn’t the primary driver of detrusor contraction. Dopaminergic and serotonergic pathways influence the broader regulation of micturition but do not provide the main direct innervation to the detrusor. Therefore, cholinergic innervation is the dominant input to the detrusor.

During voiding, the detrusor smooth muscle is driven mainly by parasympathetic, cholinergic input. Nerves release acetylcholine, which acts on M3 muscarinic receptors on the detrusor to trigger contraction and you get bladder emptying. The sympathetic system, by contrast, mainly supports storage—relaxing the detrusor via β-adrenergic receptors and contracting the internal sphincter via α1 receptors—so it isn’t the primary driver of detrusor contraction. Dopaminergic and serotonergic pathways influence the broader regulation of micturition but do not provide the main direct innervation to the detrusor. Therefore, cholinergic innervation is the dominant input to the detrusor.

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