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Titolo:
A quantitative study of cochlear afferent axons in birds
Autore:
Koppl, C; Wegscheider, A; Gleich, O; Manley, GA;
Indirizzi:
Tech Univ Munich, Inst Zool, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 ool, D-85747 Garching, Germany Univ Regensburg, HNO Klin, D-93042 Regensburg, Germany Univ Regensburg Regensburg Germany D-93042 , D-93042 Regensburg, Germany
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 139, anno: 2000,
pagine: 123 - 143
SICI:
0378-5955(200001)139:1-2<123:AQSOCA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
STARLING STURNUS-VULGARIS; AUDITORY-NERVE FIBERS; OWL TYTO-ALBA; EMU DROMAIUS-NOVAEHOLLANDIAE; PIGEON BASILAR PAPILLA; HAIR CELL REGENERATION; BARN OWL; NUCLEUS MAGNOCELLULARIS; FREQUENCY REPRESENTATION; SOUND LOCALIZATION;
Keywords:
auditory; basilar papilla; eighth nerve; barn owl; chicken; myelination;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
76
Recensione:
Indirizzi per estratti:
Indirizzo: Koppl, C Tech Univ Munich, Inst Zool, Lichtenbergstr 4, D-85747 Garching, Germany Tech Univ Munich Lichtenbergstr 4 Garching Germany D-85747 rmany
Citazione:
C. Koppl et al., "A quantitative study of cochlear afferent axons in birds", HEARING RES, 139(1-2), 2000, pp. 123-143

Abstract

This paper is a comparative study of auditory-nerve morphology in birds. The chicken (Gallus gallus), the emu (Dromaius novaehollandiae) and the starling (Sturnus vulgaris) were chosen as unspecialised birds that have already been used in auditory research The data are discussed in comparison to a similar earlier study on the barn owl: a bird with highly specialised hearing, in an attempt to separate general avian patterns from species specialisations. Average numbers of afferent fibres from 8775 (starling) to 12406 (chicken) were counted, excluding fibres to the lagenar macula. The number offibres representing different frequency ranges showed broad maxima in the chicken and emu, corresponding to hearing ranges of best sensitivity and/orparticular behavioural relevance. Mean axon diameters were around 2 mu m in the chicken and starling and around 3 mu m in the emu. Virtually all auditory afferents were myelinated. The mean thickness of the myelin sheaths was between 0.33 mu m (starling) and 0.4 mu m (emu). There was a consistent pattern in the diameters of axons deriving from different regions. Axons from very basal, i.e. highest-frequency, parts of the basilar papilla were always the smallest. In the emu and the chicken, axons from the middle papillar regions were, in addition, larger than axons innervating apical regions, (C) 2000 Elsevier Science B.V, All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 06:25:46