Salivary Glands - Salivary Glands: Salivary glands are...

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Unformatted text preview: Salivary Glands: Salivary glands are compound (branched) tubuloacinar glands. They are surrounded by a moderately dense connective tissue from which septa divide the secretory portion of the gland into lobes and lobules. The secretory unit is the acinus, which is made up of either serous cells, mucous cells, or both cell types (mixed acinus). Numerous lymphocytes and plasma cells populate the CT surrounding the acini in both major and minor salivary glands. The plasma cells synthesize the antibodies that are secreted by the salivary glands as secretory immunoglobulin A. Myoepithelial cells embrace the basal aspect of the acinar secretory cells move secretory produces toward the excretory ducts. Role of Saliva: Moistening dry food, aid in swallowing, dissolving and suspending food materials that chemically stimulate taste buds, buffering the contents of the oral cavity with its high concentration of bicarbonate ion, digestion of carbs by the digestive enzyme alpha amylase- which breaks there 1-4 glycoside bonds and continues to act in the esophagus and stomach, and controlling the bacterial flora of the oral cavity because of the antibacterial enzyme lysozyme. Saliva is also source of calcium and phosphate ions essential for normal tooth development and maintenance. It also contains antibodies, notably salivary sIgA. Salivation is part of a reflex arc that is normally stimulated by the ingestion of food, although sight, smell, or even thoughts of food can also stimulate salivation. Submandibular Gland: Parotid Gland: Largest of the major salivary glands. Composed of alveoli containing only serous secretory cells. Adipose tissue often occurs in the parotid gland and may be a distinguishing feature. The facial nerve passes through the parotid gland. Sublingual Gland: The smallest of the salivary glands. Their multiple small ducts empty into the submandibular ducts as well as directly onto the floor of the mouth. IT contains both serous and mucous elements. The mucous acini predominate. Esophagus: This tube has the same basic structural organization through its length. Its wall is formed by four distinctive layers. From the lumen outward, they are: -Mucosa:...
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This note was uploaded on 02/21/2012 for the course BIO 89515 taught by Professor Janmachart during the Fall '09 term at University of Texas at Austin.

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Salivary Glands - Salivary Glands: Salivary glands are...

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