It resembles the carotid body in its microscopical structure, but is not so vascular.
It is probable, however, that this structure has nothing to do with the carotid body of Mammalia.
The probability is that, like the carotid body, it is sympathetic in origin.
carotid body n.
A small epithelioid structure, located just above the bifurcation of the common carotid artery on each side that serves as a chemoreceptor organ responsive to lack of oxygen, excess of carbon dioxide, and increased concentration of hydrogen ions. Also called intercarotid body.
|carotid body |
A mass of tissue near the carotid sinus that contains chemical receptors sensitive to oxygen and pH levels in the blood and that is involved in the regulation of respiratory activity.