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Each acinus consists of a single layer of cuboidal epithelial cells surrounding a lumen, a central opening where the saliva is deposited after being produced by the secretory cells. The three forms of acini are classified in terms of the type of epithelial cell present and the secretory product being produced - serous, mucoserous, and mucous.
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 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.
After sectioning the serous cells resembled the common demilune shape, and were so named. [2] When the gland has this demilunar structure, it has mucoserous acini producing both serous and mucous secretions. Slice of submandibular gland. H&E staining, the structure of the red stained cytoplasm on the left is the serous demilunes.
The mucous salivary glands are similar in structure to the buccal and labial glands. They are found especially at the back part behind the vallate papillae, but are also present at the apex and marginal parts. In this connection, the anterior lingual glands require special notice.
At the right is a group of mucous acini, at the left a group of serous acini. Lobes contain smaller lobules, which contain adenomeres , the secretory units of the gland. Each adenomere contains one or more acini , or alveoli, which are small clusters of cells that secrete their products into a duct.
Mucous acini usually stain pale, while serous acini usually stain dark. Lungs. The end of the terminal bronchioles in the lungs mark the beginning of a pulmonary ...
The sublingual gland (glandula sublingualis) is a seromucous polystomatic exocrine gland.Located underneath the oral diaphragm (diaphragma oris), the sublingual gland is the smallest and most diffuse of the three major salivary glands of the oral cavity, with the other two being the submandibular and parotid.
Serous fluid may also originate from mixed glands, which contain both mucous and serous cells. A common trait of serous fluids is their role in assisting digestion , excretion , and respiration . In medical fields, especially cytopathology , serous fluid is a synonym for effusion fluids from various body cavities .