Salivary gland. Light micrograph (LM) of a sectioned gland. The submandibular glands (also called sublingual) are bilateral salivary glands located in the face. Their mixed serous(right of image) and mucous salivary secretions are important for the lubrication of food during mastication to enable effective swallowing and aid digestion. Magnification: x150 when printed 10cm wide.