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. 1970 May;208(1):133–152.3. doi: 10.1113/jphysiol.1970.sp009110

Electron microscopic and electrophysiological studies on the carotid body following intracranial section of the glossopharyngeal nerve

T J Biscoe, A Lall, S R Sampson
PMCID: PMC1348776  PMID: 5499751

Abstract

1. The innervation of carotid body Type I cells has been investigated in seventeen cats. At a sterile operation the glossopharyngeal and vagus nerve roots were cut intracranially on one side.

2. From 1½ to 378 days after the operation the carotid bodies were fixed in situ and prepared for electron microscopy. Nerve endings on Type I cells were found to degenerate with a prolonged time course. In each cat there was a decrease in the number of nerve endings on the operated side as compared with the non-operated side.

3. Before the carotid bodies were fixed, recordings were made from chemoreceptor, and baroreceptor, afferent fibres in the sinus nerve on the operated side. The chemoreceptors responded in the usual way to changes in arterial O2, CO2 and pH; the injection of cyanide evoked a brisk response.

4. It is concluded that the nerve endings on Type I cells are efferent rather than afferent and the cell bodies of their axons are probably in the brain stem.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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