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.
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- * Amyotrophic lateral sclerosis (ALS) is the most common acquired motor neuron disease, with multiple variants affecting different motor neuron types; characteristic MRI features include T2 hyperintensities along key areas of the brain.
- * Other conditions, including toxic, metabolic, genetic, and infectious diseases, can also damage corticospinal tracts, leading to upper motor neuron injury symptoms, which can be identified through MRI imaging.
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