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OLS Field Name OLS Field Data
Main Title Terminal Arbors of Axons Projecting to the Somatosensory Cortex of the Adult Rat. 1. The Normal Morphology of Specific Thalamocortical Afferents.
Author Jensen, K. F. ; Killackey, H. P. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. ;California Univ., Irvine.
Year Published 1987
Report Number EPA-600/J-87/336;
Stock Number PB88-202098
Additional Subjects Cerebral cortex ; Rats ; Laboratory animals ; Morphology ; Reprints ; Neurology ; Terminal arbors
Holdings
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NTIS  PB88-202098 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1988
Collation 17p
Abstract
A characteristic feature of the rat somatosensory neocortex is a discrete topographic representation of the facial whiskers. Afferent fibers projecting to this vibrissae representation were 'bulk-labeled' by injecting horseradish peroxidase into the white matter. Terminal arbors of specific thalamocortical afferents were characterized by their discretely organized layer IV plexus. The size of the terminal arbors varied with their location and paralleled the regional distribution of different size vibrissae related-clusters, indicating that a single afferent rabor tends to fill a cluster. This interpretation was supported by two additional observations. One, when two fibers terminated within a single cluster their terminal arbors appeared largely coextensive. Two, when fibers were reconstructed from tangential sections, terminal arbors appeared to be concentrated within single clusters. The observations, together with the results of previous studies, indicate that the size of a terminal arbor innervating a vibrissa related cluster is related to the extent of the peripheral innervation of the corresponding vibrissa.