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14 Cards in this Set
- Front
- Back
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What are the 4 layers of the GI tract?
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Mucosa, submucosa, muscularis externa, and serosa or adventitia
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What three sublayers comprise the mucosa layer?
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Epithelium, lamina propria, and muscularis mucosa
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What cells make up the epithelium and what are their function?
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Stratified squamous works as a barrier, protection.
Simple Columnar's function is absorption. |
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What is the lamina propria composed of, and what does it contain?
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loose connective tissue layer that contains blood and lymphatic vessels.
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What is the composition and function of the muscularis mucosa?
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Thin smooth muscle layer that functions as independent movement of mucosa.
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What predisposes someone to Mallory-Weiss tears?
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Tiny defects in the muscularis mucosa.
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What is the composition of the submucosa and what does it contain?
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Dense irregular connective tissue that contains larger blood and lymphatic vessels and submucosal (Meissner's) autonomic plexus of nerves.
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The muscularis externa is comprised of what 2 layers of muscle?
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Inner circular, closest to epithelium, and outer longitudinal layer of smooth muscle.
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What runs in between the 2 layers of muscle in the muscularis externa?
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Myenteric (Auerbach's) nerve plexus
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What is serosa comprised of?
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loose CT covered with a simple squamous epithelium.
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What is Adventitia?
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binds surfaces outside peritoneal cavity to posterior abdominal wall, comprised of loose CT only
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What is Hirschsprung disease?
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absence or reduction in the number of ganglion cells of myenteric and/or submucosal plexuses
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What does Chagas disease primarily effect?
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Nervous system and heart.
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8-year-old female presents with abdominal pain that is found to be Chagas disease. What components of the colon wall is most likely to be involved?
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Myenteric plexus
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