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Titolo:
A comparative morphometric analysis of the optic nerve in two cetacean species, the striped dolphin (Stenella coeruleoalba) and fin whale (Balaenoptera physalus)
Autore:
Mazzatenta, A; Caleo, M; Baldaccini, NE; Maffei, L;
Indirizzi:
Dipartimento Etol Ecol & Evoluz, I-56126 Pisa, Italy Dipartimento Etol Ecol & Evoluz Pisa Italy I-56126 , I-56126 Pisa, Italy Scuola Normale Super Pisa, I-56100 Pisa, Italy Scuola Normale Super Pisa Pisa Italy I-56100 r Pisa, I-56100 Pisa, Italy CNR, Ist Neurofisiol, I-56100 Pisa, Italy CNR Pisa Italy I-56100CNR, Ist Neurofisiol, I-56100 Pisa, Italy
Titolo Testata:
VISUAL NEUROSCIENCE
fascicolo: 2, volume: 18, anno: 2001,
pagine: 319 - 325
SICI:
0952-5238(200103/04)18:2<319:ACMAOT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIBER DIAMETER SPECTRUM; VISUAL-ACUITY; GANGLION-CELLS; RETINA; COUNT; TOPOGRAPHY; AXONS; SIZE; RAT; CAT;
Keywords:
whale; dolphin; giant axons; fiber density; plesiomorphic character;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Mazzatenta, A Dipartimento Chim & Biotecnol Agr, Via S Michele degli Scalzi 4, I-56124 Pisa, Italy Dipartimento Chim & Biotecnol Agr Via S Michele degli Scalzi 4 Pisa Italy I-56124
Citazione:
A. Mazzatenta et al., "A comparative morphometric analysis of the optic nerve in two cetacean species, the striped dolphin (Stenella coeruleoalba) and fin whale (Balaenoptera physalus)", VIS NEUROSC, 18(2), 2001, pp. 319-325

Abstract

A comparative study was made on one Mysticete (the fin whale, Balaenopteraphysalus) and one Odontocete species (the striped dolphin, Stenella coeruleoalba) by measuring several morphological characteristics seen in cross sections of the optic nerve. We found that the two cetacean nerves share a number of specializations that distinguish them from the optic nerve of terrestrial mammals. Fiber density is approximately two-fold lower than in land mammals. A corresponding increase in the cross-sectional area occupied by astrocytes is observed. A population of "giant" (up to 15 mum in diameter) optic axons is present in both the B. physalus and the S. coeruleoalba nerve. It is argued that these features probably reflect common adaptations to the constraints imposed by tile aquatic environment. "Giant" optic axons might ensure short-latency detection of preys and other targets during navigation while the increased astroglial content might be related to the maintenance of neuronal function during periods of anaerobic metabolism under water.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:13:54