A region of muscle in many organs in the vertebrate body, adjacent to the submucosa membrane. It is responsible for gut movement such as peristalsis. [ http://en.wikipedia.org/wiki/Muscular_layer ]

Synonyms: muscular layer tunica muscularis muscularis layer

This is just here as a test because I lose it

Term information

editor note

currently this class conflates a generic layer of muscle and a specific layer found lining the digestive tract (the muscularis externa), typically composed of circular and longitudinal layers (although this varies)

external definition

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[BTO].

has related synonym

muscularis externa

tunica externa

muscularis propria

transverse muscular fibers

tunica muscularis

muscular coat




taxon notes

typically smooth muscle, but there may be exceptions - in the upper esophagus, part of the externa is skeletal muscle, rather than smooth muscle.