Ascending spinal projections to the optic tectum, facial and vagal lobes in the goldfish, Carassius auratus

Using biotinylated dextran-amines as tracer, we observed prominent ascending spinal projections to three unreported areas in the gold fish brain viz. the optic tectum (OT), facial (FL) and vagal (VL) lobes. From the lateral spinal lemniscus (LSL), some fiber tracts separated off and extended mediodo...

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Bibliographic Details
Published in:Brain research 1999-01, Vol.817 (1-2), p.209-214
Main Authors: Prasada Rao, P.D., Sharma, S.C.
Format: Article
Language:English
Subjects:
Afferent Pathways - physiology
Anatomy
Animals
Ascending spinal projection
Biological and medical sciences
Brain Mapping
Central nervous system
Facial lobe
Facial Nerve - physiology
Fundamental and applied biological sciences. Psychology
Goldfish
Goldfish - physiology
Optic tectum
Spinal cord
Spinal Cord - physiology
Superior Colliculi - physiology
Vagal lobe
Vagus Nerve - physiology
Vertebrates: nervous system and sense organs
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Summary:Using biotinylated dextran-amines as tracer, we observed prominent ascending spinal projections to three unreported areas in the gold fish brain viz. the optic tectum (OT), facial (FL) and vagal (VL) lobes. From the lateral spinal lemniscus (LSL), some fiber tracts separated off and extended mediodorsally, fanned out and innervated the FL. The VL was clearly laminated and showed three layers—the inner primary motor neuron and fiber layer (PMNF), outer secondary neuron layer (SN) and middle primary and secondary fiber layer (PSF). The PMNF received maximal innervation. Besides several fibers extending directly into the SN from the LSL, a few fibers extended dorsolaterally from the PMNF and innervated the SN. Several ascending fibers extended into the torus semicircularis, thalamic and pretectal areas and innervated the OT. The possible functional significance of the spinal innervation of these brain areas has been discussed.
ISSN:0006-8993
1872-6240
DOI:10.1016/S0006-8993(98)01213-X