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Electron microscopic observations on the juxtamedullary efferent arterioles and Arteriolae rectae in kidneys of rats

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Summary

Efferent arterioles leaving juxtamedullary glomeruli in the kidneys of rats have a media comprized of a layer of closely packed smooth muscle cells. This muscle coat continues along the length of the efferent arterioles and arteriolae rectae to a level deep in the outer medullary zone, where smooth muscle cells are gradually replaced by pericytes characteristic of the non-muscular arterial vasa recta.

Bundles of unmyelinated nerve fibers accompany the efferent arterioles and arteriolae rectae to the level where smooth muscle is no longer found in the media of the latter vessels. Close associations between smooth muscle cells and axons are marked by axonal dilatations which lie adjacent to muscle cells. There is no modification of either the axonal or the muscle cell membrane at these sites, nor do axons penetrate the basal lamina of muscle fibers. Large granular vesicles and small granular and agranular vesicles occur in most axons at the dilations, although the granular material in the small granular vesicles is usually sparse and in dispersed form.

The nerves are considered to be primarily adrenergic because of strong catecholamine fluorescence demonstrated by other workers in association with the efferent arteries and arteriolae rectae. Poor definition of the small granular vesicles, which are commonly supposed to contain catecholamines, is ascribed to extraction of catecholamines during processing, discharge of granules prior to fixation, or inability of these axons to store catecholamines in quantity under physiological conditions.

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  1. Department of Anatomy, University of Saskatchewan, Saskatoon

    J. Newstead & I. Munkacsi

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  1. J. Newstead
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  2. I. Munkacsi
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Financial assistance during the progress of this work was obtained from the Medical Research Council of Canada.

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Newstead, J., Munkacsi, I. Electron microscopic observations on the juxtamedullary efferent arterioles and Arteriolae rectae in kidneys of rats. Z. Zellforsch. 97, 465–490 (1969). https://doi.org/10.1007/BF00332797

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  • DOI: https://doi.org/10.1007/BF00332797

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