BIO 144 Lecture 8- Upper Digestive Tract

Other terms for DIGESTIVE TRACT. Choose two.

• Gastrointestinal tract

• Integumentary System

• Digestive System

• Alimentary Canal

Also called Fundic glands, these gastric glands themselves fill most of the mucosa, with several formed by branching at the isthmus or neck of each gastric pit. These are very rich in digestive enzymeproducing parietal and chief cells, as the majority of digestion takes place in the body and fundus of the stomach.

• Gastric glands proper

• Gastric pits

• Pyloric glands

• Cardiac glands

[Secretory Epithelial Cells of the Gastric Glands]

They have round nuclei and apical secretory granules. Secretes mucus that is less alkaline than the surface epithelial mucous cells.

• Parietal (Oxyntic) Cells

• Chief (Zymogenic) Cells

• Mucous Neck Cells

• Enteroendocrine Cells

Gastric glands are found throughout the entire inner surface of the stomach and are divided into 3 types depending on the region in which they are found:

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Gastric glands proper

Pyloric glands

Cardiac glands

The surface mucus cells and gastric pits secrete a thick, adherent, and highly viscous mucous layer, which is rich in and protects the mucosa from both abrasive effects of intraluminal food and the corrosive effects of stomach acid.

A narrow transitional zone between the esophagus and the stomach. Primarily involved with mucus secretion.

• Cardia

• Fundus

• Body

• Pylorus

Four major regions make up the human (simple) stomach:

• Pylorus

• Cardia

• Body

• Rugae

• Fundus

type of epithelium of the stomach

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simple columnar epithelium

epithelium type of esophagus

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(thick) stratified squamous epithelium

A junction characterized by an abrupt transition from the thick stratified squamous epithelium of the esophagus to the simple columnar epithelium of the stomach