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Titolo:
Reversed tonotopic map of the basilar papilla in Gekko gecko
Autore:
Manley, GA; Koppl, C; Sneary, M;
Indirizzi:
Tech Univ Munich, Inst Zool, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 ool, D-85747 Garching, Germany San Jose State Univ, Dept Biol Sci, San Jose, CA 95192 USA San Jose State Univ San Jose CA USA 95192 iol Sci, San Jose, CA 95192 USA
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 131, anno: 1999,
pagine: 107 - 116
SICI:
0378-5955(199905)131:1-2<107:RTMOTB>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOKAY-GECKO; FREQUENCY REPRESENTATION; LIZARD TILIQUA; HAIR-CELLS; MODEL; COCHLEA; NERVE; ORGANIZATION; INNERVATION; RESONANCE;
Keywords:
Tokay gecko; gekko; tonotopic; frequency map; tuning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Manley, GA Tech Univ Munich, Inst Zool, Lichtenbergstr 4, D-85747 Garching, Germany Tech Univ Munich Lichtenbergstr 4 Garching Germany D-85747 any
Citazione:
G.A. Manley et al., "Reversed tonotopic map of the basilar papilla in Gekko gecko", HEARING RES, 131(1-2), 1999, pp. 107-116

Abstract

A published model of the frequency responses of different locations on thebasilar papilla of the Tokay gecko Gekko gecko (Authier and Manley, 1995. Hear. Res. 82, 1-13) had implied that (a) unlike all other amniotes studiedso far, the frequency map is reversed, with the low frequencies at the base and the high frequencies at the apex, and (b) the high-frequency area is split into two parallel-lying hair cell areas covering different frequency ranges. To test these hypotheses. the frequency representation along the basilar papilla of Gekko gecko was studied by recording from single auditory afferent nerve fibers and labelling them iontophoretically with horseradishperoxidase. Successfully labelled fibers covered a range of characteristicfrequencies from 0.42 to 4.9 kHz, which extended from 78% to 9% of the total papillar length, as measured from the apex. The termination sites of labelled fibers within the basilar papilla correlated with their characteristic frequency, the lowest frequencies being represented basally, and the highest apically. This confirms the first prediction of the model. The map indicates, however, that one of the two high-frequency papillar regions (the postaxial segment) represents the full high-frequency range, from about 1 to 5 kHz. No functionally identified labelling was achieved in the preaxial segment. Thus the assumptions underlying the proposed model need revision. A good mathematical description of the frequency distribution was given by anexponential regression with a mapping constant in the living state of approximately 0.4 mm/octave. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 30/11/20 alle ore 03:36:14