Морфологические особенности околоушной слюнной железы и структура ферментоактивных зон нервно-мышечных синапсов латеральной жевательной мышцы белых крыс при питании диспергированной пищей

The aim of the study was to investigate the histomorphological features of the parotid salivary gland and structure enzymatic activities zones of neuromuscular synapses lateral masseter under the conditions of long-term dispersed food feeding. The experimental studies were conducted on male outbreed white rats. It has been shown that on the 240th day of the postnatal ontogenesis the animals eating dispersed food have a decrease in the size of epithelial cells of intralobular ducts, which implies a significant reduction in cross-sectional area of these excretory ducts walls. Dispersed food feeding causes changes in the functional role of the lateral masseter muscle during mastication, being shown in more difficult differentiated movements of this muscle associated with processing in the oral cavity dispersed food, unusual for this type of animals. Consequence of lateral masseter adaptation to the functional load change was the increase in the relative amount of complex enzymatic activities zones of neuromuscular synapses and amplification of their structure, the increase relative number and area of enzymatic activities zones per one muscle fiber.