Muscarinic receptors relevant to bladder function are primarily located in which tissue?

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Muscarinic receptors that control bladder contraction are located on the detrusor smooth muscle of the bladder. When acetylcholine is released by parasympathetic nerves, it binds to these receptors and causes the detrusor muscle to contract, allowing the bladder to expel urine. Receptors exist in other tissues like brain, heart, and lungs, but for bladder function the key site is the bladder itself.