Abstract
Using immunocytochemical technique, the light and electron microscopic localization of substance P and glutamic acid decarboxylase (GAD) immunoreactivity in the feline lateral cervical nucleus (LCN) has been investigated. A dense substance P labeling, confined mainly to boutons contacting dendritic profiles, was demonstrated in the ventromedial part of the LCN. GAD-positive boutons, frequently in contact with cell bodies, were found scattered throughout the nucleus. The results suggest that γ-aminobutyric acid is an inhibitory transmitter in the LCN. The role of the substance P is unclear. Its distribution, however, supports the concept of a separate function of the ventromedial part of the LCN.
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