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Quantitative Studies of Rat Carotid Body Type I Cell Nerve Endings

D.J. Pallot, N. Blakeman

Abstract

The results of a stereological and morphometric analysis of rat carotid body type I cell nerve endings are described. 66.9% of endings possessed symmetrical junctions. Of the remaining endings, 3.6% were presynaptic and 26% were postsynaptic to type I cells; 3.6% of endings had a reciprocal configuration. Apart from membrane specialisations, no other ultrastructural criteria were found to distinguish the different types of endings. Ventilation with 100% and 10% oxygen showed that the hypoxic mixture reduced synaptic vesicle concentration in the nerve endings; this effect was independent of the innervation to the carotid body.

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Key concepts: Free nerve ending, Carotid body, Postsynaptic potential, Glomus cell, Synaptic vesicle, Anatomy, Ultrastructure, Cell type