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Titolo:
CONDUCTION AND SYNAPTIC TRANSMISSION IN THE OPTIC-NERVE AND THE SUPERIOR COLLICULUS DURING DEVELOPMENT OF THE RETINOCOLLICULAR PROJECTION IN THE WALLABY (MACROPUS-EUGENII)
Autore:
FREEMAN TCB; JAMES AC; MARK RF;
Indirizzi:
AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,DEV NEUROBIOL GRP,GPO BOX 475 CANBERRA ACT 2601 AUSTRALIA AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,DEV NEUROBIOL GRP CANBERRA ACT 2601 AUSTRALIA
Titolo Testata:
Journal of comparative neurology
fascicolo: 4, volume: 380, anno: 1997,
pagine: 472 - 484
SICI:
0021-9967(1997)380:4<472:CASTIT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRENATAL DEVELOPMENT; GANGLION-CELLS; FUNCTIONAL-DEVELOPMENT; POSTNATAL-DEVELOPMENT; RETINOTECTAL PATHWAY; SUPERFICIAL LAYERS; EVOKED-POTENTIALS; MAMMALIAN RETINA; VISUAL-CORTEX; NEONATAL RAT;
Keywords:
CURRENT SOURCE DENSITY ANALYSIS; MARSUPIAL; POUCH YOUNG; VISUAL SYSTEM; EVOKED POTENTIALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
T.C.B. Freeman et al., "CONDUCTION AND SYNAPTIC TRANSMISSION IN THE OPTIC-NERVE AND THE SUPERIOR COLLICULUS DURING DEVELOPMENT OF THE RETINOCOLLICULAR PROJECTION IN THE WALLABY (MACROPUS-EUGENII)", Journal of comparative neurology, 380(4), 1997, pp. 472-484

Abstract

When do the developing connections between mammalian retinal ganglioncells and the superior colliculus become functional? Evoked potentials elicited by optic nerve stimulation in the pouch young of the wallaby were used to answer the question. Up to 42 days after birth, the evoked potentials in the colliculus appeared to be generated by axon conduction. Synaptic activity was first recorded from the rostral colliculus at 45 days, and was found to be progressively more caudal, spreading to cover the colliculus, by 65 days. From the earliest indication ofsynaptic activity until eye opening at 140 days, current source density (CSD) analysis consistently showed the same basic pattern: an initial deep sink from synaptic activity of fast (Y type) fibres, and a more superficial longer-latency sink from slower (W type) fibres. All features became more clearly delineated with age. The indirect retinocorticocollicular connection appeared between 134 days and 146 days. The ability of optic nel-ve fibres to sustain action potentials precedes their formation of functional synapses with collicular neurons, which happens abruptly at three months before eye opening. CSD analysis showedthat the relationship between the conduction velocity of optic nerve fibres and their depth of termination is evident from the first signs of synapse formation. (C) 1997 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 22:13:47