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Questions and Answers
Which organ features Rugae and gastric pits in its folds of the epithelium?
Which organ features Rugae and gastric pits in its folds of the epithelium?
- Small Intestine
- Large Intestine
- Stomach (correct)
- Esophagus
What specialized structures can be found in the submucosa of the duodenum?
What specialized structures can be found in the submucosa of the duodenum?
- Submucosal mucous glands
- None
- Peyer's patches
- Brunner's glands (correct)
How many smooth muscle layers does the esophagus have?
How many smooth muscle layers does the esophagus have?
- 2 (correct)
- 3
- 4
- 1
Which of the following organs does NOT contain any specialized structures in its submucosa?
Which of the following organs does NOT contain any specialized structures in its submucosa?
What are the epithelial folds present in the small intestine?
What are the epithelial folds present in the small intestine?
Which organ has three layers in its muscularis?
Which organ has three layers in its muscularis?
What structures are found in the submucosa of the ileum?
What structures are found in the submucosa of the ileum?
Which organ's epithelial folds include Haustra and intestinal glands?
Which organ's epithelial folds include Haustra and intestinal glands?
What is a notable feature of the muscularis externa in the pyloric region of the stomach?
What is a notable feature of the muscularis externa in the pyloric region of the stomach?
What characterizes the mucosa of the pyloric region of the stomach?
What characterizes the mucosa of the pyloric region of the stomach?
Which statement is true regarding the submucosa and serosa of the pyloric region?
Which statement is true regarding the submucosa and serosa of the pyloric region?
What is the primary function of the pyloric glands in the stomach?
What is the primary function of the pyloric glands in the stomach?
Where do the deeper gastric pits in the pyloric region extend in the mucosa?
Where do the deeper gastric pits in the pyloric region extend in the mucosa?
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Study Notes
Histology of the Digestive System
- The histology of the digestive system can be divided into three sections: Folds of the Epithelium, Histology of the Submucosa, and Histology of the Muscularis.
Folds of the Epithelium
- The esophagus has no folds of the epithelium.
- The stomach has rugae and gastric pits.
- The small intestine has plicae circulares, villi, crypts of Lieberkuhn, and microvilli.
- The large intestine has haustra and intestinal glands.
Histology of the Submucosa
- The esophagus has submucosal mucous glands.
- The stomach has no specialized structures in the submucosa.
- The duodenum has Brunner's glands.
- The ileum has Peyer's Patches.
- The large intestine has no specialized structures in the submucosa.
Histology of the Muscularis
- The esophagus has two smooth muscle layers: circular and longitudinal.
- The stomach has three smooth muscle layers: oblique, circular, and longitudinal.
- The small intestine has two smooth muscle layers: circular and longitudinal.
- The large intestine has two smooth muscle layers: circular and longitudinal.
Stomach (Pyloric Region)
- Mucosa consists of pyloric glands in the lamina propria and deeper gastric pits that extend half the thickness of the mucosa
- Muscularis Externa is composed of an inner circular layer (thickened to form the pyloric sphincter) and an outer longitudinal layer
- Submucosa and Serosa are similar in structure to the fundic part of the stomach
Pyloric Glands
- Located in the duodenum
- Responsible for producing mucous to aid in food passage through the digestive system
- Found in the pyloric region of the stomach
- Responsible for the production of mucous in the stomach
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