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The response of capillary endothelium to changes in intravascular pressure, as seen in the rabbit s ear chamber


, : The response of capillary endothelium to changes in intravascular pressure, as seen in the rabbit s ear chamber. Australian Jour Exptl Biol 31(5): 533-544

In a series of ten rabbits, the capillaries in certain areas of thin-tissue chambers were constricted to varying degrees following compression of the central artery of the ear, and responded instantly to changes in intravascular pressure. Sympathectomy did not influence this response. Capillaries in some areas in four 8-week old chambers showed similar responses of constriction and endothelial nuclear prominence to compression of the central artery of the ear, compression of the common carotid artery and stimulation of the cervical sympathetic trunk. Lowering the intravascular pressure produced changes in form in the larger vessels of the preformed tissue. Resulting stresses in the fibrous tissue were transmitted to the vessels of the thin tissue under observation, thus invalidating this technique where quantitative relationships are sought between vascular diams. and intravascular pressures. It is concluded that capillary responses are passive only, detd. by the elasticity of the endothelial wall, the intravascular pressure, and the mechanical stresses in the surrounding tissues. Attempts were made to develop the technique of supra-vital methylene blue staining of nerves, but the results were inconstant. One nerve fiber was stained and photographed in relation to a capillary.

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PMID: 13115314


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