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Physiology of neuronal subtypes in the respiratory-vocal integration nucleus retroamigualis of the male zebra finch.

Abstract：

:Learned vocalizations, such as bird song, require intricate coordination of vocal and respiratory muscles. Although the neural basis for this coordination remains poorly understood, it likely includes direct synaptic interactions between respiratory premotor neurons and vocal motor neurons. In birds, as in mammals, the medullary nucleus retroambigualis (RAm) receives synaptic input from higher level respiratory and vocal control centers and projects to a variety of targets. In birds, these include vocal motor neurons in the tracheosyringeal part of the hypoglossal motor nucleus (XIIts), other respiratory premotor neurons, and expiratory motor neurons in the spinal cord. Although various cell types in RAm are distinct in their anatomical projections, their electrophysiological properties remain unknown. Furthermore, although prior studies have shown that RAm provides both excitatory and inhibitory input onto XIIts motor neurons, the identity of the cells in RAm providing either of these inputs remains to be established. To characterize the different RAm neuron types electrophysiologically, we used intracellular recordings in a zebra finch brain stem slice preparation. Based on numerous differences in intrinsic electrophysiological properties and a principal components analysis, we identified two distinct RAm neuron types (types I and II). Antidromic stimulation methods and intracellular staining revealed that type II neurons, but not type I neurons, provide bilateral synaptic input to XIIts. Paired intracellular recordings in RAm and XIIts further indicated that type II neurons with a hyperpolarization-dependent bursting phenotype are a potential source of inhibitory input to XIIts motor neurons. These results indicate that electrically distinct cell types exist in RAm, affording physiological heterogeneity that may play an important role in respiratory-vocal signaling.

journal_name

J Neurophysiol

journal_title

Journal of neurophysiology

authors

Kubke MF,Yazaki-Sugiyama Y,Mooney R,Wild JM

doi

10.1152/jn.00257.2005

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

2379-90

issue

eissn

0022-3077

issn

1522-1598

pii

00257.2005

journal_volume

pub_type

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Physiology of neuronal subtypes in the respiratory-vocal integration nucleus retroamigualis of the male zebra finch.