Anatomy and Cell Biology 2221 Lecture Notes - Lecture 12: Peritoneum, Gastric Glands, Mucous Gland
25 Jul 2020
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Elastic fiber enable alimentary canal return to its shape after food material passes through: muscularis externa: 2 muscle layers that perform peristalsis/segmentation, inner circular layer: around canal, squeeze tube for segmentation. Thick layers sphinters to prevent retrograde motion: outer longitudinal layer: fibers orient longitudinally, shorten tube (peristalsis, serosa visceral peritoneum : thin later of moist tissue, reduce friction. Esophagus: connects pharynx to stomach: pass through esophageal hiatus in diaphragm join stomach at cardial orifice, cardiac sphincter closes lumen. Gastroesophageal reflux disease: stomach acids erode wall causing burn (heartburn) Hiatal hernia: abdominal esophagus or superior part pushes through hiatus (heartburn) Produce pepsin (digest enzyme, function only in acidic conditions) 4 regions: cardia: encircle cardial orifice (contain cardiac sphincter, fundus: rises above, gas bubbles accumulate, body: majority of stomach, pyloic region: canal & antrum (contains pyloric sphincter) Gastric pits open into tubular gastric glands: gastric pits: lining of surface epithelium is mucous cells, gastric gland: lining among diff regions.
