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The classical site of muscarinic receptors is at the postganglionic parasympathetic neuroeffector junction in smooth muscle, heart, and exocrine glands. However, muscarinic receptors also exist on effectors cells, even in the absence of cholinergic innervation.Prototype agonists include muscarine and ACh.he classical site of muscarinic receptors is at the postganglionic parasympathetic neuroeffector junction in smooth muscle, heart, and exocrine glands. However, muscarinic receptors also exist on effectors cells, even in the absence of cholinergic innervation. Prototype agonists include muscarine and ACh.
the saccule and utricle The sensory receptors for static equilibrium are located in structures called maculae (singular is macula), which are found in the saccule and utricle. The macula sacculi lies nearly vertically in the wall of the saccule, and the macula utriculi lies almost horizontally on the floor of the utricle. These receptors take notice when our bodies move faster or slower in a forward or backward direction.