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30 Cards in this Set
- Front
- Back
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Shape of stomach
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"J"
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Major Portions of stomach
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-Cardia
-Fundus -Body -Pylorus |
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Cardia
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Surrounds superior opening of stomach
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Fundus
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Rounded portion; superior and left of cardia
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Body
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Inferior to fundus, large central portion
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Pylorus
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Connects stomach to duodenum
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Greater curvature
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Convex lateral border
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Lesser curvature
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Cancave medial border
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Pyloric valve
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(sphincter) Where stomach communicates w/small intestine at duodenum
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Mucosa of stomach wall
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Simple columnar epithelial cells
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Rugae
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in stomach wall; large folds (inside)
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Gastric pits
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In stomach wall; openings that extend into lamina propria; caontain gastric glands
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Gastric glands
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occur at the bottom of gastric pits; each gland consists of 4 types of secreting cells
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Chief cell
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(zymogenic)
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Pepsigen
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chief cell; inactive for of pepsin- pepsin + HCL= pepsin (enzyme that dig. protien)
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Gastric lipase
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Chief cell; splits fats in buttermilk; has limited role in adults
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Parietal cells
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(ocyntic)
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Hydrochloric acid
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Parietal cell; acts on pepsinogen to produce active enz. "pepsin"
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Intrinsic factor
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Needed for absorption of vitamin B12
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Mucous cells
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secrete mucous; also called mucous neck cells
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Gastric juices
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Consists of Chief(Zymogenic) cells, Parietal(oxyntic) cells, and Mucous cells
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Enteroendocrine cells
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(g cell); secrets hormones
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Stomach gastrin
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1. Stimulates growth of gastric cells
2. Secretes gastric juices 3. Increases stomach motility 4. Relaxes pyloric & iliocecal sphincters 5. Strengthen contraction of lower esophageal sphincter |
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Submucosa of stomach
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Areolar conn. tissue
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3 layers of muscularis in stomach
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outer layer = longitudinal
middle layer = circular inner layer = oblique |
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Chyme
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A soupy liquid resulting from mixing with digestive juices
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Functions of stomach
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1. Mixing waves
2. Storage 3. Digestion |
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Mixing waves
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gentle rippling peristaltic movements
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Pepsin
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From interaction of pepsinogen and HCL; digests protein
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Gastric lipase
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Works on fat in buttermilk in infants, limited in adults, pancreatic lipase is esp. important in adults
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