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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.
1 Parotid glands: These are the largest salivary glands and are found in front of and just below each ear. 2  Most major salivary gland tumors begin in this gland. 3  Sublingual glands: These glands are found under the tongue in the floor of the mouth. 4  Submandibular glands: These glands are found below the jawbone. Symptoms and signs of salivary gland cancer include painless lump(s) in the area of the ear, cheek, jaw, lips, or mouth and/or fluid draining from the ear, trouble swallowing, difficulty opening the mouth, numbness or weakness to the face, and/or facial pain.