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Titolo:
ELECTRON-MICROSCOPIC STUDY OF SYNAPTOGENESIS AND MYELINATION OF THE OLFACTORY CENTERS IN DEVELOPING RATS
Autore:
MORIIZUMI T; SAKASHITA H; FURUKAWA M; KAWANO J; OKOYAMA S; KITAO Y; KUDO M;
Indirizzi:
KANAZAWA UNIV,SCH MED,DEPT ANAT KANAZAWA ISHIKAWA 920 JAPAN KANAZAWA UNIV,SCH MED,DEPT OTORHINOLARYNGOL KANAZAWA ISHIKAWA 920 JAPAN
Titolo Testata:
Experimental Brain Research
fascicolo: 3, volume: 103, anno: 1995,
pagine: 385 - 392
SICI:
0014-4819(1995)103:3<385:ESOSAM>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
PIRIFORM CORTEX; AFFERENT-FIBERS; NEONATAL RAT; INFANT RATS; BULB; CONNECTIONS; MOUSE; STIMULATION; PLACODE; NEURON;
Keywords:
DEVELOPMENT; OLFACTORY BULB; PRIMARY OLFACTORY CORTEX; LATERAL OLFACTORY TRACT; RAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
T. Moriizumi et al., "ELECTRON-MICROSCOPIC STUDY OF SYNAPTOGENESIS AND MYELINATION OF THE OLFACTORY CENTERS IN DEVELOPING RATS", Experimental Brain Research, 103(3), 1995, pp. 385-392

Abstract

Development of the central olfactory system was studied in the rat with;an electron microscope at three main structures: the olfactory bulb, the lateral olfactory tract, and the primary olfactory cortex (the piriform cortex). As a parameter of development, the synaptic density was examined quantitatively in the bulbar glomerulus and layer Ia (termination of bulbofugal fibers) of the piriform cortex, which are the key stations of the olfactory pathway. The synaptic densities in the glomerulus and those in layer Ia were 5.7% and 4.6% on embryonic day 19, 15.8% and 12.5% on postnatal day (P) 0, and 57.3% and 37.2% on P10, ascompared with the adult (100%). As another parameter of development, the density of myelinated axons in the lateral olfactory tract was-examined quantitatively. The densities of myelinated axons in the tract were O% on P5, 15.1% on P10, and 73.5% on P21 of the adult density. Maturation in the tract was still progressing, even at P21, in terms of bundle formation and the thickness of myelin sheaths. The results show that synaptogenesis in the bulbar glomerulus is followed by synaptogenesis in layer Ia of the piriform cortex, and that myelination in the lateral olfactory tract occurs over a prolonged period, even in the stages after P21.

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Documento generato il 10/07/20 alle ore 00:15:41