Abstract
Clusters of neuronal cells which have intense immunoreactivity to tyrosine-hydroxylase were found in intralaryngeal ganglia. Under electron microscopic bservation, they contained a vast amount of large cored vesicle in the neuronal somata, and the vesicles resembled to small intensely fluorescent (SIF) cells. Found in the synpathetic nervous system. Moreover, the vesicles also contained leucine enkephalin. Almost all SIF cells were observed near fenestrated-type capillaries in the intralaryngeal ganglia. It may be suggested that they also participate in autonomic regulation in the larynx.
