Scopolamine is a well known competitive muscarinic receptor antagonist that causes reproducible, transient impairments across multiple cognitive domains in healthy animals and non-diseased humans by decreasing central cholinergic neuronal activity [124, 125]. (alzres.biomedcentral.com)
In particular, they noted that the outgrowth of neurites — projections from a neuronal cell body that connect it to other neurons — was constrained by activation of muscarinic acetylcholine receptors. (sciencedaily.com)
The acronym SLUD stands for salivation, lacrimation, urination, and defecation, which are the clinical signs associated with muscarinic cholinergic overstimulation caused by certain toxins. (merckvetmanual.com)