Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches.

Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Research Abstract Details 

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Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Abstract Text:

Todd F Roberts,J Martin Wild,M Fabiana Kubke,Richard Mooney,

Sex differences in behavioral repertoires are often reflected in the underlying electrophysiological and morphological properties of motor neurons. Male zebra finches produce long, spectrally complex, learned songs and short calls, whereas female finches only produce short, innate, and spectrally simple calls. In both sexes, vocalizations are produced by using syringeal muscles controlled by motoneurons within the tracheosyringeal part of the hypoglossal motor nucleus (XIIts). We asked whether the sexually dimorphic vocal repertoire of adult zebra finches is paralleled by structural and functional differences in syringeal motoneurons. By using immunohistochemical and intracellular staining methods, we describe sex differences in the morphology of XIIts and its surrounding neuropil (suprahypoglossal region; SH). Although the overall number of XIIts neurons and the proportions of somata/neuropil were not sexually dimorphic, the volumes of both XIIts and SH were larger in males, in part because male XIIts neurons had larger somata. In contrast, female XIIts motoneurons had a more complex dendritic structure than did male neurons, suggesting that the larger volume of the male XIIts is due in part to increased numbers of afferents. Intracellular recordings in brain slices revealed that the intrinsic electrophysiological properties of female XIIts neurons were similar to published values for male XIIts motoneurons. We also show that female neurons received glycinergic inputs from the brainstem respiratory premotor column, similar to those described in males. These findings indicate that male and female zebra finches produce their disparate vocal repertoires using physiologically similar motoneurons. Thus, sites upstream of the motoneuron pool may be the major determinants of sexually dimorphic vocal behaviors in this species.

Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Publishing Authors By Initials

TF Roberts,JM Wild,MF Kubke,R Mooney,

For similar behavior and behavior mechanisms: behavior: behavior, animal: animal communication: vocalization, animal research abstracts see: behavior and behavior mechanisms: behavior: behavior, animal: animal communication: vocalization, animal research

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Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Journal of comparative neurology

VOLUME: 502

Page Numbers: 157-69

Journal Abbreviation: J. Comp. Neurol.

ISSN: 0021-9967

DAY: 1

MONTH: May

YEAR: 2007

Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Information

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LANGUAGE: eng

NlmUniqueID: 406041

Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches. Keywords Mesh Terms:

KEYWORDS: Vocalization, Animal

MESH TERMS: physiology

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Grant and Affiliation Information for Homogeneity of intrinsic properties of sexually dimorphic vocal motoneurons in male and female zebra finches.

AFFILIATION: Department of Neurobiology, Duke University Medical Center, Durham North Carolina 27710, USA.

Country: United States

AGENCY: United States NINDS

GRANT: T32NS07370

ACRONYM: NS

MEDLINETA: J Comp Neurol

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