Salivation - secretion of salivary glands.
Salivation reflex occurs under the influence of unconditional and conditional stimuli. The person as the conditional stimulus may be verbal signal.
Secretion of major salivary glands (see the Salivary glands) intermittent, is regulated mainly by the nervous mechanisms and is used for wetting coming into the mouth of substances (see Saliva). Secretion of small glands continuous and is used to hydrate the mucous membranes of the oral cavity.
Reflex salivation is carried out with the participation sljunootdelitelnoe center, founded in the medulla, under the influence of the parasympathetic and sympathetic nerves. In experiments on animals have shown, that during stimulation of the sympathetic nerve stands out a little thick saliva, and if irritation parasympathetic nerve much fluid saliva.
Autonomic nervous system affects the blood supply to the cancer. Irritation of the parasympathetic nerves causes vasodilatation and this contributes to the release of water from the bloodstream into the duct, while irritation of the sympathetic nerve causes narrowing of the blood vessels and reduces the inflow to water gland. Salivary secretion occurs not only due to the simple filtering, but also due to the intensive education of saliva in the glandular cells.
Salivation may occur not only as a result of nerve, but humoral mechanisms. It was found that the introduction of atropine suppresses the secretion of salivary glands, whereas the introduction of pilocarpineon the contrary, causes enhanced secretion of these glands even in conditions of their denervation.
In salivation may impact various pathological conditions. So, for example, excessive salivation (gipersalivacia) may occur with nausea, neuralgia troinicnogo nerve, stomatitis. The decrease in salivary flow (giposalivation) is observed in some infectious diseases, pneumonia, diabetes, etc.