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mucous cells, which produce a very mucus-rich secretion Acini in the parotid glands are almost exclusively of the serous type, while those in the sublingual glands are predominantly mucus cells. In the submaxillary glands, it is common to observe acini composed of both serous and mucus epithelial cells. In the histologic sections of canine salivary gland shown above, the cells stained pink are serous cells, while the white, foamy cells are mucus-secreting cells. Secretion of saliva is under control of the autonomic nervous system, which controls both the volume and type of saliva secreted.
Salivary gland infections affect the glands that produce spit (saliva). The infection may be due to bacteria or viruses. There are 3 pairs of major salivary glands: Parotid glands: These are the 2 largest glands. One is located in each cheek over the jaw in front of the ears. Inflammation of 1 or more of these glands is called parotitis, or parotiditis. Submandibular glands: These 2 glands are located just under both sides of the lower jaw and carry saliva up to the floor of the mouth under the tongue.