muscular coat
noun
: an outer layer of smooth muscle surrounding a hollow or tubular organ (as the bladder, esophagus, large intestine, small intestine, stomach, ureter, uterus, and vagina) that often consists of an inner layer of circular fibers serving to narrow the lumen of the organ and an outer layer of longitudinal fibers serving to shorten its length
called also muscularis externa, tunica muscularis
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“Muscular coat.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/muscular%20coat. Accessed 29 Nov. 2024.
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