Abstract
The total number of catecholamine (CA) and 5-hydroxy-trydroxy-tryptamine (5-HT) containing nerve cell bodies in groups A1-7 and B1-3 were counted using Falck-Hillarp fluorescence histochemistry and found to be about 5000 and about 6300 respectively. The total number of CA axons in the white matter of the spinal cord was found to be about 4300 at the cervical level and about 3300 at the lumbar level as revealed in cryostat sections. Together with previous studies our quantitative results suggest that individual cell bodies in locus coeruleus send axon collaterals to the spinal cord, cortex cerebri, cortex cerebelli and probably also other areas of the brain.
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