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Titolo:
PIT ORGANS IN AXOLOTLS - A 2ND CLASS OF LATERAL LINE NEUROMASTS
Autore:
NORTHCUTT RG; BLECKMANN H;
Indirizzi:
UNIV CALIF,SCRIPPS INST OCEANOG,NEUROBIOL UNIT,9500 GILMAN DR LA JOLLA CA 92092 UNIV CALIF SAN DIEGO,DEPT NEUROSCI SAN DIEGO CA 92092 TH DARMSTADT,INST ZOOL W-6100 DARMSTADT GERMANY
Titolo Testata:
Journal of comparative physiology. A, Sensory, neural, and behavioral physiology
fascicolo: 4, volume: 172, anno: 1993,
pagine: 439 - 446
SICI:
0340-7594(1993)172:4<439:POIA-A>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOPOGRAPHY; URODELES; SYSTEM;
Keywords:
NEUROMASTS; PIT ORGANS; SALAMANDERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
R.G. Northcutt e H. Bleckmann, "PIT ORGANS IN AXOLOTLS - A 2ND CLASS OF LATERAL LINE NEUROMASTS", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 172(4), 1993, pp. 439-446

Abstract

The lateral line system of axolotls (Ambystoma mexicanum) consists ofmechanoreceptive neuromasts and electroreceptive ampullary organs. All neuromasts in salamanders are located superficially and are organized into lines that are homologous to canal neuromasts in fishes. Ampullary organs are confined to the head and generally are located adjacentto the lines of superficial neuromasts. Axolotls, however, also possess a third class of receptors; these form restricted patches on the head and are possibly homologous to the superficial pit organs in fishes. In order to test this hypothesis the morphology of the suspected pitorgans was examined with scanning electron microscopy, and a number of their physiological properties were determined. Pit organs are approximately half the size of neuromasts and have fewer hair cells, although these hair cells do possess kinocilia and stereocilia like those ofneuromasts. Pit organs also possess cupulae and exhibit a pattern of innervation identical to that of neuromasts. Pit organs and neuromastsalso exhibit similar rates of spontaneous activity, are excited by weak water currents but not weak electric stimuli, and are not inhibitedby magnesium ions. Pit organs appear to have slightly lower rates of spontaneous discharge than neuromasts, however, and have slightly lower displacement thresholds to low frequency wave stimuli. These data support the contention that the pit organs of axolotls constitute a second class of neuromasts homologous to the pit organs of fishes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 08:20:14