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Titolo:
Cochlear mechanisms from a phylogenetic viewpoint
Autore:
Manley, GA;
Indirizzi:
Tech Univ Munich, Inst Zool, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 ool, D-85747 Garching, Germany
Titolo Testata:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
fascicolo: 22, volume: 97, anno: 2000,
pagine: 11736 - 11743
SICI:
0027-8424(20001024)97:22<11736:CMFAPV>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASILAR-MEMBRANE MOTION; HAIR-CELLS; AUDITORY-NERVE; TONOTOPIC ORGANIZATION; MOSSBAUER TECHNIQUE; GEKKO-GECKO; PAPILLA; TRANSDUCTION; INNERVATION; MOVEMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
53
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, "Cochlear mechanisms from a phylogenetic viewpoint", P NAS US, 97(22), 2000, pp. 11736-11743

Abstract

The hearing organ of the inner ear was the last of the paired sense organsof amniotes to undergo formative evolution. As a mechanical sensory organ,the inner-ear hearing organ's function depends highly on its physical structure. Comparative studies suggest that the hearing organ of the earliest amniote vertebrates was small and simple, but possessed hair cells with a cochlear amplifier mechanism, electrical frequency tuning, and incipient micromechanical tuning. The separation of the different groups of amniotes fromthe stem reptiles occurred relatively early, with the ancestors of the mammals branching off first, approximately 320 million years ago. The evolution of the hearing organ in the three major lines of the descendents of the stem reptiles (e.g., mammals, birds-crocodiles, and lizards-snakes) thus occurred independently over long periods of time. Dramatic and parallel improvements in the middle ear initiated papillar elongation in all lineages, accompanied by increased numbers of sensory cells with enhanced micromechanical tuning and group-specific hair-cell specializations that resulted in Unique morphological configurations. This review aims not only to compare structure and function across classification boundaries (the comparative approach), but also to assess how and to what extent fundamental mechanisms were influenced by selection pressures in times past (the phylogenetic viewpoint).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 03:01:30