GI Histology Lab
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PAL3_Histology_Digestive_System_Atlas-1.pptxEsophagus, Lower Third; Cross Section 40x
Submucosa
Stratified squamous epithelium
Mucosa
Adventitia
Longitudinal muscle of muscularis externa
Circular muscle of muscularis externa
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A cross sectional micrograph highlights the features of the lower third esophagus, magnified forty times. From top to bottom, they are as follows. Circular muscle of muscularis externa, submucosa, stratified squamous epithelium, longitudinal muscle of muscularis externa, mucosa, and adventitia.
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Esophagus, Lower Third; Cross Section 100x
Submucosa
Muscularis mucosae
Lamina propria
Stratified squamous epithelium
Circular muscle of muscularis externa
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A cross sectional micrograph highlights the features of the lower third esophagus, magnified one hundred times. From top to bottom, they are as follows. Circular muscle of muscularis externa, submucosa, muscularis mucosae, lamina propria, and stratified squamous epithelium.
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Esophagus, Lower Third, Mucosa; Cross Section 400x
Stratified squamous epithelium
Muscularis mucosae
Lamina propria
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Esophagus; Cross Section 40x
Submucosa
Adventitia
Muscularis externa
Lamina propria
Lumen
Stratified squamous epithelium
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Esophagus; Cross Section 100x
Stratified squamous epithelium
Submucosa
Circular muscle of muscularis externa
Lamina propria
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Esophagus, Mucosa; Cross Section 200x
Muscularis mucosae
Lamina propria
Stratified squamous epithelium
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Fundic Stomach; Cross Section 40x
Serosa
Longitudinal muscle of muscularis externa
Circular muscle of muscularis externa
Oblique muscle of muscularis externa
Submucosa
Mucosa
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A cross sectional micrograph highlights the features of a fundic stomach, magnified forty times. From top to bottom, they are as follows. Mucosa, submucosa, oblique muscle of muscularis externa, serosa, circular muscle of muscularis externa, and longitudinal muscle of muscularis externa.
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Fundic Stomach; Cross Section 100x
Simple columnar epthelium
Gastric pits
Parietal cells
Chief cells
Muscularis mucosae
Oblique muscle of muscularis externa
Submucosa
Gastric glands in lamina propria
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A cross sectional micrograph highlights the features of a fundic stomach, magnified one hundred times. From top to bottom, they are as follows. Gastric glands in lamina propria, simple columnar epithelium, gastric pits. Submucosa, parietal cells, chief cells, oblique muscle of muscularis externa, and muscularis mucosae.
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Fundic Stomach; Cross Section 400x
Simple columnar epthelium
Gastric pits
Parietal cells
Gastric glands in lamina propria
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Stomach, Layers Of The Gastric Wall; Cross Section 20x
Serosa
Muscularis externa
Submucosa
Mucosa
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Stomach; Cross Section 100x
Parietal cells
Gastric pits
Gastric glands in lamina propria
Muscularis mucosae
Submucosa
Arteriole
Venule
Chief cells
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A cross sectional micrograph highlights the features of a stomach, magnified one hundred times. From top to bottom, they are as follows. Gastric pits, venule, chief cells, parietal cells, arteriole, submucosa, muscularis mucosae, and gastric glands in lamina propria.
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Simple Columnar Epithelium, Small Intestine; Cross Section 1000x
Goblet cell
Simple columnar epithelium
Basement membrane
Nuclei
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Duodenum, Plica Circulares; Cross Section 40x
Villi
Intestinal crypts
Submucosa of plica circulares
Muscularis externa
Duodenal glands
Mucosa of plica circulares
Plica circulares
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A cross sectional micrograph highlights the features of a duodenum plica circulares, magnified forty times. From top to bottom, they are as follows. Plica circulares, mucosa of plica circulares, villi, submucosa of plica circulares, duodenal glands, intestinal crypts, and muscularis externa.
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Duodenum; Cross Section 40x (1 of 2)
Villus
Submucosa of plica circulares
Serosa
Duodenal glands
Muscularis externa
Mucosa of plica circulares
Plica circulares
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A cross sectional micrograph highlights the features of a duodenum, magnified forty times. From top to bottom, they are as follows. Plica circulares, villus, mucosa of plica circulares, muscularis externa, submucosa of plica circulares, duodenal glands, and serosa.
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Duodenum; Cross Section 100x
Simple columnar epithelium
Villi
Duodenal glands
Longitudinal muscle of muscularis externa
Circular muscle of muscularis externa
Intestinal crypts
Muscularis mucosae
Submucosa
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A cross sectional micrograph highlights the features of a duodenum, magnified one hundred times. From top to bottom, they are as follows. Submucosa, simple columnar epithelium, villi, muscularis mucosae, intestinal crypts, circular muscle of muscularis externa, duodenal glands, and longitudinal muscle of muscularis externa.
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Duodenum; Cross Section 400x
Nuclei
Lamina propria of villus
Villus
Microvilli
Simple columnar epithelium
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A cross sectional micrograph highlights the features of a duodenum, magnified four hundred times. From top to bottom, they are as follows. Nuclei, simple columnar epithelium, microvilli, lamina propria of villus, and villus.
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Duodenum, Muscularis Externa; Cross Section 400x (1 of 2)
Circular muscle
Myenteric nerve plexus
Serosa
Longitudinal muscle
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A cross sectional micrograph highlights the features of a duodenum muscularis externa, magnified four hundred times. From top to bottom, they are as follows. Longitudinal muscle, circular muscle, serosa, and myenteric nerve plexus.
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Duodenum; Cross Section 40x (2 of 2)
Villi
Mucosa
Submucosa
Muscularis externa
Serosa
Duodenal glands
Intestinal crypts
Muscularis mucosae
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A cross sectional micrograph highlights the features of a duodenum, magnified forty times. From top to bottom, they are as follows. Mucosa, villi, muscularis mucosae, submucosa, intestinal crypts, muscularis externa, duodenal glands, and serosa.
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Large Intestine; Longitudinal Section 40x
Submucosa
Serosa
Teniae coli
Circular muscle of muscularis externa
Mucosa
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Large Intestine; Longitudinal Section 100x
Intestinal crypts
Simple columnar epithelium
Circular muscle of muscularis externa
Submucosa
Muscularis mucosae
Goblet cells
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A longitudinal micrograph highlights the features of the large intestine, magnified one hundred times. From top to bottom, they are as follows. Intestinal crypts, goblet cells simple columnar epithelium, muscularis mucosae, submucosa, and circular muscle of muscularis externa.
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Large Intestine, Mucosa; Longitudinal Section 200x
Intestinal crypts
Simple columnar epithelium
Submucosa
Muscularis mucosae
Goblet cells
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A longitudinal micrograph highlights the features of a large intestine mucosa, magnified forty times. From top to bottom, they are as follows. Intestinal crypts, goblet cells, simple columnar epithelium, muscularis mucosae, and submucosa.
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Liver; Cross Section 40x (1 of 2)
Liver lobules
Portal triads
Central veins
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Liver; Cross Section 100x
Liver lobule
Central vein
Portal triads
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Liver; Cross Section 200x
Portal triad
Hepatic portal venule
Hepatic arteriole
Bile duct
Hepatocytes
Central vein
Sinusoids
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Liver; Cross Section 40x (2 of 2)
Liver lobule
Central vein
Liver sinusoids
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Liver, Portal Triad; Cross Section 400x (1 of 2)
Hepatic arteriole
Hepatic portal venule
Sinusoid
Hepatocytes
Bile duct
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Liver, Portal Triad; Cross Section 400x (2 of 2)
Bile duct
Hepatic arteriole
Hepatic portal venule
Hepatocytes
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Liver, Central Vein; Cross Section 1000x
Hepatocytes
Sinusoids
Central vein
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Gall Bladder Wall
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The gallbladder is the storage vessel for bile. Its wall is composed of the following layers:
Mucosa (or mucous membrane) - the empty bladder has numerous deep folds (or rugae) often resulting in the appearance of cross bridges.
Simple Columnar Epithelium - similar in appearance to absorptive cells in the intestines.
Lamina Propria - dense irregular connective tissue that supports the epithelium. It is rich in fenestrated capillaries and small venules.
Tunica Muscularis - randomly oriented bundles of smooth muscle containing numerous collagen and elastic fibers. Its contraction results in emptying of the gallbladder.
Outer Layer of Connective Tissue - composition depends on its location.
Adventitia - where the gallbladder attaches to the liver. It is composed of dense irregular connective tissue.
Serosa - where the gallbladder is unattached to the liver. It is composed of a surface layer of mesothelium supported by loose connective tissue.
Despite its origin from the foregut, the gallbladder does not have a muscularis mucosae or submucosa.
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Gall Bladder Wall
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Gall Bladder Mucosa
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