Acetylcholinesterase in central vocal control nuclei of the zebra finch (<Emphasis Type="Italic">Taeniopygia guttata</Emphasis>) |
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Authors: | Monika Sadananda |
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Institution: | (1) Department of Applied Zoology, Mangalore University, Mangalagangothri, 574 199 Mangalore, India |
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Abstract: | The distribution of acetylcholinesterase (AChE) in the central vocal control nuclei of the zebra finch was studied using enzyme
histochemistry. AChE fibres and cells are intensely labelled in the forebrain nucleus area X, strongly labelled in high vocal
centre (HVC) perikarya, and moderately to lightly labelled in the somata and neuropil of vocal control nuclei robust nucleus
of arcopallium (RA), medial magnocellular nucleus of the anterior nidopallium (MMAN) and lateral magnocellular nucleus of
the anterior nidopallium (LMAN). The identified sites of cholinergic and/or cholinoceptive neurons are similar to the cholinergic
presence in vocal control regions of other songbirds such as the song sparrow, starling and another genus of the zebra finch
(Poephila guttata), and to a certain extent in parallel vocal control regions in vocalizing birds such as the budgerigar. AChE presence in
the vocal control system suggests innervation by either afferent projecting cholinergic systems and/or local circuit cholinergic
neurons. Co-occurrence with choline acetyltransferase (ChAT) indicates efferent cholinergic projections. The cholinergic presence
in parts of the zebra finch vocal control system, such as the area X, that is also intricately wired with parts of the basal
ganglia, the descending fibre tracts and brain stem nuclei could underlie this circuitry’s involvement in sensory processing
and motor control of song. |
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Keywords: | Acetylcholinesterase birdbrain histochemistry song vocal control system zebra finch |
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