Term
| What are the main 'layers' of the GI tract from inside to outside? |
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Definition
Tunica Mucosa
Tunica Submucosa
Tunica Muscularis
Tunica Adventitia |
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Term
| How does the tunica mucosa vary in structure? |
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Definition
Oral cavity, esophagus & canal have a protective mucosa (SSE)
Secretory mucosa throughout the digestive tube contains various glands
Absorptive mucosa has villi & microvilli
Absorptive/Protective mucosa of the LI is designed for both water absorption and mucous secretion |
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Term
| What is the submucosal (meissner's) plexus, where is it found and what does it do? |
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Definition
| junction of nerves in the submucosa, controls the muscularis mucosa & submucosal glands |
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Term
| What is the myenteric plexus (auerbach's), where is it found and what does it do? |
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Definition
| junction of nerves between the layers of the tunica muscularis, controls peristalsis |
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Term
| How can you tell if you are looking at esophageal tissue? |
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Definition
| will see submucosal glands AND stratified squamous epithelium, as well as skeletal muscle |
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Term
| What is the importance of having mucous glands at the junction between the stomach & esophagus? |
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Definition
| provides protection incase of acid reflux |
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Term
| In the simple stomach, mixing and partial digestion of food results in the production of... |
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Definition
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Term
| What are the regions of the stomach? |
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Definition
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Term
| What type of epithelium does the stomach have? |
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Definition
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Term
| Characteristics of cardiac glands |
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Definition
simple tubular, cells have a flattened basal nucleus
empty into gastric pits |
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Term
| What do cardiac glands secrete? |
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Definition
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Term
| What do fundic (gastric) glands secrete? |
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Definition
| mucus & acid-peptic gastric juices |
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Term
| Characteristics of fundic/gastric glands |
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Definition
short neck (gastric pit) with a long gland body
simple branched tubular |
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Term
| What do plyoric glands secrete? |
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Definition
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Term
| What do parietal cells secrete? |
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Definition
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Term
| What do chief cells secrete? |
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Definition
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Term
| Long gastric pit with smaller gland proper = |
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Definition
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Term
| Short gastric pit with long gland proper = |
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Definition
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Term
| Cells of fundic glands & their secretions |
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Definition
Neck cells (mucous)
Parietal cells (HCl)
Chief cells (pepsinogen)
Enteroendocrine cells (gastrin) |
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Term
| What are the 2 types of enteroendocrine cells? |
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Definition
Closed type don't reach lumen, will release product into CT to reach the vascualture
Open cells reach the lumen and can sense gut contents, will release their contents in response |
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Term
| What do ondoblasts secrete? |
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Definition
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Term
| What do ameloblasts secrete? |
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Definition
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Term
| What layer of stomach muscle is thickened to make the cardiac sphincter? |
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Definition
| circular smooth muscle of tunica muscularis |
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Term
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Definition
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Term
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Definition
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Term
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Definition
esophagus
tunica mucosa, submucosa and muscularis |
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Definition
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Definition
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