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Corticospinal projections from areas 4 and 6 in the raccoon



Corticospinal projections from areas 4 and 6 in the raccoon



Experimental Brain Research 79(2): 240-248



The corticospinal projections from areas 4 and 6 were investigated in the raccoon using the horseradish peroxidase (HRP) retrograde tracing technique. Multiple injections of lectin bound HRP and HRP were made into either the cervical or lumbar cord in 7 anesthetized raccoons. Retrogradely labeled neurons were observed throughout a wide extent of areas 4 and 6a.beta. The HRP positive cells were most numerous within the dorsal bank of the cruciate sulcus within are 4 and continued around the fundus to occupy the lateral two-thirds of the ventral bank of the cruciate sulcus within area 6a.beta. No labeled cells were observed in the more medially located area 6a.alpha. Although the HRP positive cells observed following the lumbar cord injections were situated slightly more medial and caudal to those observed following the cervical cord injections, considerable overlap between the two projections was noted. The corticospinal projections arising from areas 4 and 6.alpha.beta. in the racoon largely correspond in locations to the regions functionally defined as the primary motor cortex and the supplementary motor area, respectively.

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Accession: 007165079

Download citation: RISBibTeXText

PMID: 2323372

DOI: 10.1007/bf00608232


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