Somatotopic organization of hindlimb cutaneous dorsal root projections to cat dorsal horn.
- 1 January 1981
- journal article
- research article
- Published by American Physiological Society in Journal of Neurophysiology
- Vol. 45 (1) , 137-143
- https://doi.org/10.1152/jn.1981.45.1.137
Abstract
As a test of the hypothesis that primary afferent cutaneous terminal neuropil has the same somatotopy as do dorsal horn cells, the projections of dorsal roots L3-S2 were studied in cats. Specifically, the projections of these roots to laminae III-IV in segments L2-S3 were depicted as schematic dorsal-view maps. These laminae are believed to receive predominantly cutaneous light-touch afferent projections. The dorsal roots projected only to those areas of dorsal horn that are somatotopically appropriate, in that a root''s dermatome overlapped the receptive fields of dorsal horn cells in the root''s projection zone. Although no simple geometrical rule can be used to describe uniformly the projections of all the roots studied, the projections can be described according to the presynaptic somatotopy hypothesis. For example, although the L5 projection is shifted laterally as it goes caudal through L6 and L7 and the S1 projection is shifted laterally as it goes rostral through L6 and L7, both shifts can be described as a displacement of fibers from relatively proximal skin by the enlarged representation of relatively distal skin in medial L6 and L7. Presynaptic primary afferent neuropil in laminae III-IV apparently has the same somatotopic organization as dorsal horn cells.This publication has 5 references indexed in Scilit:
- Projections of two hindlimb cutaneous nerves to cat dorsal horn.Journal of Neurophysiology, 1980
- Trajectory of group Ia afferent fibers stained with horseradish peroxidase in the lumbosacral spinal cord of the cat: Three dimensional reconstructions from serial sectionsJournal of Comparative Neurology, 1979
- Morphology and organization of axon collaterals from afferent fibres of slowly adapting type I units in cat spinal cord.The Journal of Physiology, 1978
- The morphology of hair follicle afferent fibre collaterals in the spinal cord of the catThe Journal of Physiology, 1977
- Dorsal horn cells that respond to stimulation of distant dorsal roots (cat)The Journal of Physiology, 1977