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4) Physiology and pharmacology of GI tract
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what is the musculature of the esophagus as it progresses down to the stomach?
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in the upper third= striated skeletal muscle
middle 1/3= mixed skeletal and smooth muscle
in the lower third= smooth muscle
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Terms in this set (23)
what is the musculature of the esophagus as it progresses down to the stomach?
in the upper third= striated skeletal muscle
middle 1/3= mixed skeletal and smooth muscle
in the lower third= smooth muscle
what is the epithelium of the esophagus?
stratified squamous epithelium
what action aids in moving food from the esophagus to the stomach?
peristalsis
what is the motor innervation of the esophagus?
directly via vagus nerve
indirectly via myenteric and submucus plexus
once the food had entered the esophagus, the swallowing center pons and medulla trigger the closure of the upper esophageal sphincter and triggers a primary peristaltic wave via the vagus nerve.
what action occurs in the muscularis externa layer of the esophagus?
-the inner circular fibers behind the bolus contracts to squeeze bolus down towards the stomach
-the outer longitudinal fibers in front contract to shorten the distance of travel
