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J Neurophysiol 88: 152-162, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 1 July 2002, pp. 152-162
Copyright ©2002 by the American Physiological Society

Intrinsic Neuronal Properties of the Chick Nucleus Angularis

Daphne Soares,1,4 Raymond A. Chitwood,2,4 Richard L. Hyson,3 and Catherine E. Carr1

 1Department of Biology, University of Maryland, College Park, Maryland 20740-4415;  2Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030;  3Department of Psychology, Florida State University, Tallahassee, Florida 32306-1270; and  4Marine Biological Laboratory, Woods Hole, Massachusetts 02543

Soares, Daphne, Raymond A. Chitwood, Richard L. Hyson, and Catherine E. Carr. Intrinsic Neuronal Properties of the Chick Nucleus Angularis. J. Neurophysiol. 88: 152-162, 2002. In vitro whole cell recording revealed intrinsic firing properties and single-cell morphology in the cochlear nucleus angularis (NA) of the chick. We classified three major classes of neurons: one-spike, damped, and tonic. A delayed inward rectifying current was observed in all classes during hyperpolarization injections. One-spike neurons responded with a single spike to depolarizing current injection and had small (stubby) radiate dendritic trees. Damped neurons responded with only a few spikes at the onset of positive current injection. More positive current inputs led to a damped response. Damped cell dendrites had a planar orientation parallel to the isofrequency axis in NA. Tonic cells produced trains of action potentials in response to a depolarizing current injection. Three variations of the tonic type had multipolar morphology, with dendrites oriented either radially (I and III) or perpendicular to the tonotopic axis (II; vertical). Tonics I and III differed in the shape of their action potential undershoot. Thus NA is both physiologically and morphologically heterogeneous.




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