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Titolo:
DEVELOPMENT OF THE TIME CODING PATHWAYS IN THE AUDITORY BRAIN-STEM OFTHE BARN OWL
Autore:
CARR CE; BOUDREAU RE;
Indirizzi:
UNIV MARYLAND,DEPT ZOOL COLLEGE PK MD 20742
Titolo Testata:
Journal of comparative neurology
fascicolo: 4, volume: 373, anno: 1996,
pagine: 467 - 483
SICI:
0021-9967(1996)373:4<467:DOTTCP>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
AVIAN COCHLEAR NUCLEUS; SOUND LOCALIZATION; INTERAURAL TIME; MONAURAL OCCLUSION; N-LAMINARIS; INTENSITY DIFFERENCES; SYNAPSE ELIMINATION; SENSITIVE PERIOD; NEURAL MAP; TYTO-ALBA;
Keywords:
COCHLEAR NUCLEUS; MAGNOCELLULARIS; LAMINARIS; AUDITORY NERVE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
C.E. Carr e R.E. Boudreau, "DEVELOPMENT OF THE TIME CODING PATHWAYS IN THE AUDITORY BRAIN-STEM OFTHE BARN OWL", Journal of comparative neurology, 373(4), 1996, pp. 467-483

Abstract

The barn owl's head grows after hatching, causing interaural distances to more than double in the first 3 weeks posthatch. These changes expose the bird to a constantly increasing range of interaural time cues. We have used Golgi and ultrastructural techniques to analyze the development of the connections and cell types of the nucleus magnocellularis (NM) and the nucleus laminaris (NL) with reference to the growth of the head. The time coding circuit is formed but immature at the timeof hatching. In the month posthatch, the auditory nerve projection tothe NM matures, and appears adult-like by posthatch day (P)21. NM neurons show a late-growth of permanent dendrites starting at P6. Over the first month, these dendrites change in length and number, depending upon rostrocaudal position, to establish the adult pattern in which high best frequency neurons have few or no dendrites. These changes are not complete by P21, when NM neurons still have more dendrites than inthe adult owl. The neurons of NL have many short dendrites before hatching. Their number is greatly reduced by P6, and then does not changeduring later development. Like NM neurons, NL neurons and dendrites grow in the first month posthatch, and at P21, NL dendrites are longer than those in the adult owl. Thus, the auditory brainstem circuits grow in the first month after hatching, but are not yet mature at the time the head reaches its adult size. (C) 1996 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 01:58:39