Microanatomical, histochemical and morphometric features of the major and selected minor salivary glands in laboratory Wistar rat.

The major and minor salivary glands are responsible for saliva production, a fluid drained in the oral cavity that will be involved in several functions at this level. The present study aimed to compare the microanatomy of the major (parotid, mandibular, sublingual) and minor salivary glands (von Ebner's and Weber's) of the Wistar rat, from a histological, histochemical and morphometrically point of view. Predominantly serous glands (parotid, mandibular and von Ebner's) showed differences in the secretion composition on both PAS and alcian blue reactions. The same observations were identified also for the mostly mucous salivary glands (sublingual and Weber). In terms of surface dimensions, the measurements suggested that the mucous acini have a greater surface compared with the serous ones, and, at the same time, a better-represented polymorphism. In conclusion, the major and minor salivary glands in Wistar rats, a commonly used species in experimental procedures, showed similarities with other species including humans, but some structural traits are breed-specific, this finding is very important for an extensive understanding of the morphophysiology of the salivary glands.