Neurons projecting from the cervical cord to the upper brain stem in the rat:A step to elucidate pain mechanisms
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Neurons projecting to the superior colliculus (CS), posterior thalamic nucleus (PO) and medial part of the medial geniculate body (GMm) were examined with the horseradish peroxidase method in the cervical cord of the rat.<BR>1) After HRP (horseradish peroxidase) injections in CS, there were a relatively large number of labeled neurons in the contralateral dorsolateral part of the lateral funiculus (DL) of Cl to C3, and a few labeled neurons in the bilateral dorsal funiculi of C1, ipsilateral DL and the contralateral lateral border of V layer of C1.<BR>2) A relatively large number of neurons projecting to GMm appeared contralaterally in DL of Cl to C3, intermediate basal nucleus of C1 and C2, and ipsilaterally in the lateral border of VIII layer of C1. A few neurons were observed ipsilaterally in DL and the central part of V layer of Cl, the lateral marginal part of V layer of C3 to C7, and contralaterally in I layer and the lateral marginal part of V layer and the lateral border of VIII layer of Cl, the medial border part of V layer of C1 and C3, the central part of V layer of C4, C5 and C7, and the medial part of VII layer of C1, C2, C5 and C6.<BR>3) After HRP injections in PO, a relatively large number of the labeled neurons were observed contralaterally in DL of C1 to C3, the most medial part of V layer of C1 and C2, and ipsilaterally in the lateral border part of VIII layer of C2, and a few neurons appeared contralaterally in the entirety of V layer of Cl and C2, and the medial part of VII layer of Cl to C3.
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