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Titolo:
Fine structure of the basilar papilla of the emu: implications for the evolution of avian hair-cell types
Autore:
Koppl, C; Gleich, O; Schwabedissen, G; Siegl, E; 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: 126, anno: 1998,
pagine: 99 - 112
SICI:
0378-5955(199812)126:1-2<99:FSOTBP>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIRD COCHLEA; INNER-EAR; AUDITORY-NERVE; TYTO-ALBA; MORPHOLOGY; CHICKENS; DIFFERENTIATION; INNERVATION; STEREOCILIA; EXPRESSION;
Keywords:
hearing; cochlea; hair cell; micromechanics; stereocilia; bird;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
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., "Fine structure of the basilar papilla of the emu: implications for the evolution of avian hair-cell types", HEARING RES, 126(1-2), 1998, pp. 99-112

Abstract

The morphology of the basilar papilla of the emu was investigated quantitatively with light and scanning electron microscopical techniques. The emu is a member of the Paleognathae, a group of flightless birds that represent the most primitive living avian species. The comparison of the emu papilla with that of other, more advanced birds provides insights into the evolution of the avian papilla, The morphology of the emu papilla is that of an unspecialised bird, but shows the full range of features previously shown to be typical for the avian basilar papilla. For example, the orientation of the hair cells' sensitive axes varied in characteristic fashion both along and across the papilla. Many of the quantitative details correlate well with the representation of predominantly low frequencies alone the papilla. The most distinctive features were an unusually high density of hair cells and an unusual tallness of the hair-cell bodies. This suggests that the evolution of morphologically very short hair cells, which are a hallmark of avian papillae, is a recent development in evolution. The small degree of differentiation in hair-cell size contrasts with the observation that a significant number of hair cells in the emu lack afferent innervation. It is therefore suggested that the development of functionally different hair-cell types in birds preceded the differentiation into morphologically trill and short hair cells. (C) 1998 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 30/11/20 alle ore 03:36:45