The major lacrimal gland of rhesus monkeys is impalpable within the fatty connective tissue of the upper lateral quadrant of the orbit. Acini of the lacrimal glands are composed of both sparsely and heavily granulated cells that histochemically resemble serous acinar cells of the submandibular salivary gland. The cytoplasmic granules are strongly periodic acid-Schiff (PAS)-positive, and some are also stained by alcian blue for acidic mucosubstances. The lacrimal gland has a simple duct system of intralobular ducts and interlobular excretory ducts. Lymphocytes and plasma cells are common in the periductal stroma. Major lacrimal glands of rhesus monkeys are suitable for comparative and correlative studies of lacrimal and salivary diseases and radiation responses.
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