Digestive System 1

Front 1

4 Layers.

Epithelium: Stratified Squamous, esophageal cardiac glandsthat secrete a mucus-like substance to lubricate the bolus.

Muscularis Mucosa: thin patchy layer of smooth muscle

Submucosa: esophageal glands proper. There are twolayers of muscle below the submucosa. If it is skeletal muscle theesophageal segment is an upper segment, if it is a mixture of smooth andskeletal, it is in the middle of the esophagus, and if you see only smooth muscle it is the segmentthat is closer to the stomach.

Adventitia: Thick layer of CT with blood vessels and adipose tissue

Serosa: lines the outside of the esophagus & see if near stomach

Back 1

Esophagus

Front 2

4 Layers.Epithelium: Stratified Squamous, esophageal cardiac glandsthat secrete a mucus-like substance to lubricate the bolus.Muscularis Mucosa: thin patchy layer of smooth muscleSubmucosa: esophageal glands proper. There are twolayers of muscle below the submucosa. If it is skeletal muscle theesophageal segment is an upper segment, if it is a mixture of smooth andskeletal, it is in the middle of the esophagus, and if you see only smooth muscle it is the segmentthat is closer to the stomach.Adventitia: Thick layer of CT with blood vessels and adipose tissueSerosa: lines the outside of the esophagus & see if near stomach

Back 2

Esophagus

Front 3

4 Layers.Epithelium: Stratified Squamous, esophageal cardiac glandsthat secrete a mucus-like substance to lubricate the bolus.Muscularis Mucosa: thin patchy layer of smooth muscleSubmucosa: esophageal glands proper. There are twolayers of muscle below the submucosa. If it is skeletal muscle theesophageal segment is an upper segment, if it is a mixture of smooth andskeletal, it is in the middle of the esophagus, and if you see only smooth muscle it is the segmentthat is closer to the stomach.Adventitia: Thick layer of CT with blood vessels and adipose tissueSerosa: lines the outside of the esophagus & see if near stomach

Back 3

Esophagus

Front 4

Abrupt change in epithelium. Stomach has simple columnar ep., mucous cells, and gastric pits

Back 4

Esophagus Stomach Junction

Front 5

Abrupt change in epithelium. Stomach has simple columnar ep., mucous cells, and gastric pits

Back 5

Esophagus Stomach Junction

Front 6

gastric pits that are ‘deeping’ into the lamina propria and that open further into the gastric glands. Parietal cells are eosinophilic, Chief cells are basophlilic with basal nuclei.

Back 6

Stomach

Front 7

gastric pits that are ‘deeping’ into the lamina propria and that open further into the gastric glands. Parietal cells are eosinophilic with a "fried egg" appearance , Peptic cells are basophlilic with basal nuclei.

Back 7

Stomach

Front 8

gastric pits that are ‘deeping’ into the lamina propria and that open further into the gastric glands. Parietal cells are eosinophilic with a "fried egg" appearance , Chief cells are basophlilic with basal nuclei.

Back 8

Stomach

Front 9

gastric pits that are ‘deeping’ into the lamina propria and that open further into the gastric glands. Parietal cells are eosinophilic with a "fried egg" appearance , Chief cells are basophlilic with basal nuclei.

Back 9

Stomach

Front 10

Abrupt change in epithelium. Duodenum has a villi brush border. Brunner's Glands in the submucosa.

Back 10

Stomach-Duodenum Junction

Front 11

Crypts of Lieberkuhn are intestinal glands, which contain Paneth cells, which in turn, contain eosinophilic granules. Brunner's Glands in submucosa.

Back 11

Duodenum

Front 12

Enterocytes are absorptive cells found near goblet cells. Central nucleus.

Back 12

Duodenum

Front 13

lacteal in villi

Back 13

Duodenum

Front 14

Brunner's glands in the jejunum's submucosa. note plicae circularis near lumen.

Back 14

Jejunum

Front 15

plicae circularis includes mucosa & submucosa layers

Back 15

Jejunum

Front 16

Unlike the stomach, whose surface is covered by a homogenous population of surface mucous (foveolar) cells, the surface epithelium of the intestinal tract shows absorptive cells as well as some number of mucus-secreting goblet cells.

Back 16

Stomach-duodenum junction

Front 17

Unlike the stomach, whose surface is covered by a homogenous population of surface mucous (foveolar) cells, the surface epithelium of the intestinal tract shows absorptive cells as well as some number of mucus-secreting goblet cells.

Back 17

Stomach-duodenum junction

Front 18

No glands in stomach's submucosa, Brunner's glands do mark the duodenum's submucosa

Back 18

Stomach-duodenum junction

Front 19

Peyer's Patches are extremely basophilic lymphatic nodules. MALT = mucosa Associated Lymphatic Tissue

Peyer's Patches are superior to the muscularis externa.

Back 19

Ileum

Front 20

Peyer's Patches are extremely basophilic lymphatic nodules. MALT = mucosa Associated Lymphatic Tissue Peyer's Patches are superior to the muscularis externa.

Back 20

Ileum

Front 21

In the colon, there are no glands opening in pits but only crypts of Lieberkhün with mostly gobletcells. The epithelium is mostly covered with goblet cells also

Back 21

Colon

Front 22

In the colon, there are no glands opening in pits but only crypts of Lieberkhün with mostly goblet cells. The epithelium is mostly covered with goblet cells also

Back 22

Colon

Front 23

Taenia Coli as a budge on the outside of the colon. The tania coli's function is to assist in peristalsis in moving undigested food particles. Its contractions form the hausfrau bulges in the colon.

Back 23

Colon