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Titolo:
Lateral magnocellular nucleus of the anterior neostriatum (LMAN) in the zebra finch: Neuronal connectivity and the emergence of sex differences in cell morphology
Autore:
Nixdorf-Bergweiler, BE;
Indirizzi:
Humboldt Univ, Inst Biol, D-10115 Berlin, Germany Humboldt Univ Berlin Germany D-10115 Inst Biol, D-10115 Berlin, Germany
Titolo Testata:
MICROSCOPY RESEARCH AND TECHNIQUE
fascicolo: 6, volume: 54, anno: 2001,
pagine: 335 - 353
SICI:
1059-910X(20010915)54:6<335:LMNOTA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SONG-CONTROL-SYSTEM; VOCAL MOTOR PATHWAY; FOREBRAIN NUCLEUS; DEVELOPMENTAL-CHANGES; AXONAL CONNECTIONS; ROBUSTUS-ARCHISTRIATALIS; HORMONE ACCUMULATION; TAENIOPYGIA-GUTTATA; PROJECTION NEURONS; AUDITORY PATHWAYS;
Keywords:
development; neuronal cell bodies; dendritic spines; synapses; sexual dimorphism; song system;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
130
Recensione:
Indirizzi per estratti:
Indirizzo: Nixdorf-Bergweiler, BE Humboldt Univ, Inst Biol, Invalidenstr 43, D-10115 Berlin, Germany Humboldt Univ Invalidenstr 43 Berlin Germany D-10115
Citazione:
B.E. Nixdorf-Bergweiler, "Lateral magnocellular nucleus of the anterior neostriatum (LMAN) in the zebra finch: Neuronal connectivity and the emergence of sex differences in cell morphology", MICROSC RES, 54(6), 2001, pp. 335-353

Abstract

The song system of birds provides a model system to study basic mechanismsof neuronal plasticity and development underlying learned behavior. Song learning and production involve discrete sets of interconnected nuclei in the avian brain. One of these nuclei, the lateral magnocellular nucleus of the anterior neostriatum (LMAN), is the output of the so-called anterior forebrain pathway known to be essential for learning and maintenance of song, both processes depending on auditory feedback. In zebra finches, only males sing and this sexually dimorphic behavior is mirrored by sexual dimorphism in neuronal structure that develops during ontogeny. Female zebra finches are not able to sing and nuclei of the song system are strongly reduced in size or even lacking, when compared to male brains. Only LMAN can be delineated as easily in females as in males. Since female zebra finches, despite being unable to sing, recognize song just as males do and form a memory for song (model acquisition) early in life, LMAN is a putative candidate for song acquisition in both sexes. Therefore, development of LMAN was studied atthe cellular and ultrastructural level in both male and female zebra finches. Regressive development of dendritic spines, enlargement of neuronal cell body and nuclei size, as well as changes at the nucleolar level are events all occurring exclusively in males, when song learning progresses. The decline in synapse number and the augmentation in synaptic contact length at synapses in LMAN in males are indicative for synaptic plasticity, whereas in females synapse number and synaptic contact length remain unchanged. Microsc. Res. Tech. 54:335-353, 2001. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 12:05:23