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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.
The salivary glands are made up of a number of different types of cells. For example, there are acinic cells, which make and release saliva. And mucoepidermoid cells that line the gland. The type of cancer you have is named after the type of cell the cancer started in.