Dorsolateral spinal afferents to some medullary sensory nuclei

摘要: The course and termination of afferents in the spinal dorsolateral fascicle to some medullary sensory nuclei were studied by tracing degeneration following lesions white matter. main conclusions depend on successive experiments; other points with single-stage lesions. dorsal column particu-larly studied; terminations these followed a clear-cut pattern, fibres arising from segments below T 6 terminating gracile nucleus those more rostral origin solely cuneate nucleus. In both nuclei, major their third most traversing deep caudal regions where also occurred. Some ended contralaterally. These restricted contrasted wide-spread seen after column. A region at pole, adjacent but clearly separable z, receives dense projection levels, former part region, latter extending ventrally. We treat this as separate subnucleus. (together studied) confined extreme Our observations confirm established view that only (below least 4–5) terminate group x arise all levels (at between C 5 L 5): neither any through columns. Dorsolateral above area lateral border external Heavy terminal was cervical T4–5