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Digestive System |
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Tooth Showing the developing dentin underneath a thin band of enamel. |
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Tongue he tongue with the filiform papilla and the salivary gland http://w3.ouhsc.edu/histology/Text%20Sections/Upper%20GI.html |
Salivary gland Serous acni are secretory cells. The striated duct functions an excretory duct. |
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Tongue This shows the taste bud and the circumvallate papilla.
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Tongue The tongue with the filiform papilla and the salivary gland
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Esophagus Esophagus showing the mucosa, submucosa, and the muscular layers. |
Esophagus Esophagus showing the mucosa, submucosa, and the muscular layers. |
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Esophagus Thick mucosa layer functions to protect the esophagus. Material is not absorbed here.
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Esophagus (transverse section)
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| http://www.siumed.edu/~dking2/erg/GI100b.htm | http://home.mc.ntu.edu.tw/~histol/Ffolder_html/ |
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Stomach Gastric pits are formed in the mucosa. The stomach may show signs of rugae, which are temporary folds of the mucosa. Gastric glands occupy the entire thickness of the mucosa. They open into the bottom of the gastric pits. There are also 3 layers of smooth muscle that are orientated in 3 different planes. |
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Stomach There are also 3 layers of smooth muscle that are orientated in 3 different planes The inner one is the oblique, the middle is the circular, and the outer one is the longitudinal |
Stomach Gastric glands open into the bottom of the gastric pits.
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Stomach Gastric glands occupy the entire thickness of the mucosa. They open into the bottom of the gastric pits |
Stomach Gastric glands open into the bottom of the gastric pits. |
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| http://www.lab.anhb.uwa.edu.au/mb140/CorePages/ | http://www.technion.ac.il/~mdcourse/274203/lect10.html |
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Small Intestine: Duodenum (first section of the small intestine) Contains extensive villi and microvilli for absorption. Goblet cells appear as light staining structures. The crypts of Lieberkuhn or intestinal glands are found in the mucosal layer. The duodenal glands or Brunner’s gland’s are found in the submucosa. There are 2 layers of smooth muscle: longitudinal and circular. |
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| http://www.deltagen.com/target/histologyatlas/atlas | http://www.siumed.edu/~dking2/erg/GI031b.htm |
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Small Intestine: Jejunum (second section of the small intestine) This is very similar to the duodenum except Brunner’s glands are absent. Extensive villi are present as are the crypts of crypts of Lieberkuhn. The pilcae cicularis are permanent folds in the intestinal mucosa. There are 2 layers of smooth muscle: longitudinal and circular. Mucosa consists of simple columnar epithelium with goblet cells. |
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| http://education.vetmed.vt.edu/Curriculum/V | http://www.deltagen.com/target/histologyatlas/atlas |
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Small Intestine: Ileum (third section of the small intestine) This is very similar to the duodenum except Brunner’s glands are absent. The villi are present as are the crypts of Lieberkuhn, the 2 layers of smooth muscle (TM) and the submocusa (SM) . However, the ileum contains lymphatic nodules called Peyer’s patches that are found in the mucosa. |
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| http://www.siumed.edu/~dking2/erg/GI027b.htm | http://www.med.mun.ca/anatomyts/digest/ |
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Large Intestine: Colon The colon has the same basic layers as the small intestine: epithelium, connective tissue and muscle. The colon does not have villi or plicae circularis; it does have numerous temporary folds caused by the movement of the smooth muscle. |
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Colon CR=glands; subm=submucosa; circ and ** = muscle bands. http://courseweb.edteched.uottawa.ca/medicine-histology/English/Gastrointestinal/Stomach35.htm |
Anorectal Junction Transition from columnar epithelium into the stratified squamous of the skin. This is "tougher" and prevents tearing. |
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http://courseweb.edteched.uottawa.ca/medicine-histology/English/Gastrointestinal/Stomach39.htm |
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Appendix Epithelium lining, with goblet cells and underlying submucosa and smooth muscle. However it also contains lymphatic nodules and other diffuse lymphatic tissue. cr = crypts; ln = lymph nodule; ME= muscle layer; mu= mucosa & subm= submucosa |
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Gallbladder There are no glands in the gallbladder. It may have temporary folds that disappear when it is extended. It consists of a mucosal layer over submucosa layer of lamina propria and is surrounded by connective tissue
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http://www.cvm.okstate.edu/instruction/mm_curr/
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http://iws.ccccd.edu/mweis/A&P%20Basics/Lab/Basics%20Lab%20Exercises/lab_exercise_19_accessoryGI.htm |
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Liver (hepatic lobule) The liver divides into lobules with a central vein. The plates of the hepatic cells radiate from the central vein. The portal vein, hepatic artery, and the bile duct are found outside the lobules. |
Portal Triad Portal triad consists of the hepatic portal vein, hepatic artery, and bile duct
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Liver (hepatic lobule) The liver lobules with a central vein (CV). The (portal canal =PC) portal vein, hepatic artery, and the bile duct are found outside the lobules. |
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Liver The portal vein, hepatic artery, and the bile duct are found outside the lobule |
Liver Different stains the show the macrophages, reticular fibers and hepatocytes. |
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Pancreas Exocrine acini produce digestive enzymes that are released in the small intestine. (Most of the cells of the pancreas of exocrine cells) The isles of Langerhorn (densely packed and lightly staining) are endocrine cells that release insulin and glucagon. |
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