Basic GI histology - Basic GI histology This notes covers...

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Basic GI histology This notes covers basic GI histology Epithelia and layers The structure of the epithelia: Simple epithelia – One cell thick Compound epithelia – More than one cell thick Main Epithelia types Squamous cell Cuboidal cell Columnar cell Layers of the GI tract Mucosa – containing the epithelial cells, lamina propria and muscularis mucosa Submucosa – the connective tissue that contains blood vessels, lymph drainage and nerves Muscularis externa – consisting of the “inner” circular and “outer” longitudinal muscle layers Serosa – consisting of an inner connective tissue layer and an out secretory epithelial layer Adventitia - outermost connective tissue covering Histology of the oesophagus Distinguishing features – The upper 2/3 of the oesophagus is comprised of skeletal muscle; whereas the lower 1/3 is made up of smooth muscle. Gut associated lymphoid tissue and submucosal mucous glands are also found in the oesophagus. Histology of the small intestine
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Basic histological units of the small bowel include villi, plicae and crypts Villi
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