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Collateral projections from trigeminal sensory nuclei to ventrobasal thalamus and cerebellar cortex in rats
Author(s) -
Patrick George W.,
Robinson Merryn A.
Publication year - 1987
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051920305
Subject(s) - thalamus , biology , sensory system , neuroscience , anatomy , cerebellum , cerebellar cortex , cortex (anatomy) , somatosensory system
The retrograde fluorescent labeling technique reveals that trigeminal projections to the ventroposteromedial nucleus of the thalamus (VPM) of the rat originate from the main sensory nucleus (MSN) of the trigeminal and subnuclei interpolaris (V 1 ) and caudalis (V c ) of the spinal trigeminal nucleus. These projections are predominately contralateral; however, the presence of a few ipsilateral labeled cells in MSN suggests an uncrossed trigeminothalamic pathway. Trigeminocerebellar fibers projecting to the paramedian lobule (PML) of the cerebellar cortex are located in V i and caudal subnucleus oralis (V 0 ). This is principally an ipsilateral pathway, but several bisbenzimide‐labeled cells are present in contralateral V i . The most notable finding occurred after paired injections of Evans Blue into VPM and bisbenzimide into PML, demonstrating neurons in V i with divergent projections to both structures. The presence of this type of projection was not found in mice (Steindler: J. Comp. Neurol. 237 :155–175, 1985) and has not been reported in other species.