A disease that threats and disables the myenteric plexus would reduce muscularis externa motility.
The myenteric plexus is a network of nerves in the gastrointestinal system that connects the layers of the muscular propria.
The plexus regulates peristalsis in the gastrointestinal tract, among other things.
Thus, a disease that threats and disables the myenteric plexus would reduce muscularis externa motility.
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