Morphometric study of blood capillaries following injection of fluid into the salivary gland
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Physiological saline was injected into the efferent duct of the parotid salivary gland of cats under a pressure of 30, 70, and 120 cm water. It was shown by the use of transmission electron microscopy, morphometry, and statistical analysis that in response to injection of fluid into the gland the capillaries interweaving around the terminal secretory segments are compressed; compression of the capillary tubules is reflected in a marked decrease in the contribution of the working lumen of the capillaries and their endothelial lining to the total area; compression of the capillary tubules is accompanied by a reduction by half in the number of functioning capillaries. Two hypotheses are put forward on the basis of the results: 1) The additional volume of blood entering the gland in response to perfusion with fluid does not reach the blood capillaries but is discharged into the veins through communicating shunts; 2) regulation of the volume of blood entering the capillaries of the parotid salivary gland of the cat must depend on the hydraulic and osmotic conditions in the interstitial space of the gland lobules.
Key Wordsparotid salivary gland functional hyperemia blood capillaries electron microscopy morphometric analysis
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