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Título: | Early onset of the rat olfactory bulb projections |
Autor: | López-Mascaraque, Laura CSIC ORCID; Carlos, Juan A. de CSIC ORCID; Valverde, Facundo | Fecha de publicación: | 1996 | Editor: | Elsevier | Citación: | Neuroscience 70: 255- 266 (1996) | Resumen: | Using the fluorescent carbocyanine tracer DiI, we examined in detail the early development of the projections emanating from the rat olfactory bulb. The study commenced at embryonic day 13 when the first fibres can be detected and ended at embryonic day 20, when all major fibre systems have been established. The first axons arising from the prospective olfactory bulb area are seen at embryonic day 13. Labelled fibres are provided with elaborate axonal growth cones advancing through the ventrolateral part of the telencephalic vesicle. At embryonic day 14, while the main fibre tract has not developed much further, some isolated fibres are located quite distally from the prospective olfactory bulb. These early fibres apparently course within a narrow cell-free space that extends caudally along the ventrolateral part of the telencephalic vesicle. At embryonic day 15, a number of labelled fibres form a compact bundle, corresponding to the lateral olfactory tract, that ultimately reaches the prospective primary olfactory cortex. The fibres do not stop growing, but continue to extend caudally at embryonic day 17. The results of this study provide new information on the development of axonal tracts in the olfactory system. We show that the olfactory tract projection develops earlier than the morphological appearance of the olfactory bulbs. This suggests that the early development of olfactory projections might not depend on the arrival of the olfactory epithelium axons and thus, could be governed by factors intrinsic to the neurons and/or cues present in the target environment. Copyright © 1995 IBRO. All rights reserved. | URI: | http://hdl.handle.net/10261/62647 | DOI: | 10.1016/0306-4522(95)00360-U | ISSN: | 0306-4522 |
Aparece en las colecciones: | (IC) Artículos |
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