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Muscle, Smooth

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Definition: Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)  coordinate with specific organ if pertinent; /growth: coordinate with MUSCLE DEVELOPMENT; /embryol: coordinate with MUSCLE DEVELOPMENT if pertinent   
Examples Esophageal Sphincter, Lower; Muscle, Smooth, Vascular; Myometrium 		Other names Smooth Muscle; Muscle, Involuntary; Smooth Muscles; Muscles, Smooth; Muscles, Involuntary; Involuntary Muscles; Involuntary Muscle
 
SubstanceCAS Registry & nameCategoriesSource
Ro 31-6930  120280-37-7   *Benzopyrans *Pyridines Muscle, Smooth/drug effects. Br J Pharmacol 1989;98 Suppl:808P
substance R  12677-01-9   *Tissue Extracts Muscle, Smooth/drug effects. Tohoku J Exp Med 110(4):407;1973
amidoline  21590-92-1 2-ethyl-3-(p-(beta-piperidinoethoxy)phenylamino)-isoindoline-1-one  *Isoindoles Muscle, Smooth/drug effects. Il Farm 27(12):708;1972; Jpn J Gastroenterol 75(8):1167;1978; Prensa Med Mexicana 41(9-10):348;1976

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