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Transcript
Muscularis Externa
•  Major smooth muscle coat of digestive tube
•  In most areas consists of two layers
–  Circular layer
•  Inner layer
•  Contraction decreases diameter of lumen
–  Longitudinal layer
•  Outer layer
•  Contraction shortens the tube
•  Contractile activity produces propulsive and mixing
movements
•  Myenteric plexus
–  Lies between the two muscle layers