Slide DMS140 [Parotid gland, human or monkey, H&E or PTS]. This is a mixed set, the human slide is a typical H&E preparation, that of monkey is a PTS. Both are of fair quality. The parotids are the largest of the salivary glands, but produce only about 30% of the saliva. It is generally described as a purely serous type. Differentiate connective tissue stroma from parenchyma (secretory cells and ducts). With advancing age white adipose tissue infiltrates the human parenchyma. Dense extraparenchymal connective tissue roughly divides the gland into lobules. The interlobular connective tissue contains the larger excretory ducts as well as nerves and blood vessels. Note the arrangement of the serous acinar secretory cells. The zymogenic granules in their apices of the cells are small and variable in staining reaction. Find representative intralobular ducts: small intercalated and larger striated ducts.