PGY300lec3GI

PGY300lec3GI - The Mouth and Esophagus Silverthorn pages...

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The Mouth and Esophagus Silverthorn pages 699-701 Dr John A. Krasney
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Phases of Digestion Cephalic phase Gastric phase Intestinal phase
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Ivan Pavlov
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Cephalic Phase Cephalic phase involves LONG reflexes from olfactory and optic receptors, and the brain (thinking about food). The efferent pathways are relayed via the autonomic nerves (vagus nerve) to the effector organs (salivary glands, stomach and pancreas). Pavlov’s dog
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Salivary acini Mucus glands Stratified squamous epithelium
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Chewing Mastication Chewing reflex
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Saliva Lubrication and Digestion Parotid glands Sublingual glands Submandibular glands
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Salivary Glands Salivary glands are EXOCRINE glands. Exocrine glands consist of secretory (acinar) cells and ducts. Primary secretions from the acinar cells are modified as they pass down the duct cells and then conveyed to the external environment (oral cavity or lumen of the gut).
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Endocrine Glands Endocrine glands secrete HORMONES into the vascular system. Hormones circulate via the blood to target organs distant from the endocrine gland. Some GI structures (stomach, pancreas) have both exocrine and endocrine functions.
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Exocrine Gland Structure Secretory Cells Duct Cells Surface Epithelial Cells
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Exocrine Glands Sweat glands Lacrimal glands Salivary glands Gastric glands Pancreas Liver
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Parotid Salivary Gland Structure
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Saliva Primary secretions of acinar cells are modified by transporters located in the cells of the salivary ducts.
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PGY300lec3GI - The Mouth and Esophagus Silverthorn pages...

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