serous gland serous gland serous glands secrete serous fluid. they contain serous acini, a grouping of serous cells that secrete serous fluid, isotonic with blood plasma, that contains enzymes such as alpha-amylase. serous glandvertical section of papilla foliata of the rabbit, passing across the folia. (serous gland labeled at bottom right.)human submaxillary gland. at the right is a group of mucous alveoli, at the left a group of serous alveoli.detailsidentifierslatinglandula serosathh2.00.02.0.03035 fma62889anatomical terms of microanatomy serous glands are most common in the parotid gland and lacrimal gland but are also present in the submandibular gland and, to a far lesser extent, the sublingual gland.