Abstract
The parenchymal cells of guinea pig carotid body—chief and sustentacular cells—are almost similar in submicroscopic structure to those that have been described in other mammalian species. The chief cells rarely show mitotic figures. Only a few myelinated nerve fibers terminate within the carotid body. In addition to the endings packed with many clear vesicles, two other types of endings are found around the chief cells. One is the adrenergic ending containing many small dense-cored vesicles, and the other is the presumptive afferent ending which contains many small mitochondria, glycogen granules, and a few vesicles. Endings similar to the latter type, probably afferent, also occur in the interstitial stroma. Some of them are thought to be originated from unmyelinated fibers. In the interstitial stroma are terminal axons packed with many dense lamellar bodies, and small bundles of extremely slender axons. These neural elements are also likely to be afferent.
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