Abstract
The chicken carotid body is richly innervated by branches from the vagus nerve immunostained with the monoclonal antibody TuJ1 to neuron-specific class III β-tubulin. Furthermore, peptidergic nerve fibers are densely distributed in and around the carotid body. After transection of the vagus nerve proximal to the nodose ganglion, TuJ1-immunoreactive fibers did not change in density but substance P- and CGRP-immunoreactive fibers were conspicuously decreased in and around the carotid body. After removal of the nodose ganglion, TuJ1-immunoreactive fibers markedly diminished and substance P- and CGRP-immunoreactive fibers almost disappeared. These results indicate that the vast majority of substance P- and CGRP-immunoreactive fibers in the chicken carotid body originate from the vagal ganglia.
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