Abstract
Fluorescent retrograde double-labeling methods were used in which Fast blue and Nuclear yellow or Diamidino yellow dihydrochloride were injected into the midbrain periaqueductal gray (PAG) and medullary reticular formation (MRF). Double-labeled neurons were most frequently observed in the lateral part of lamina V, in laminae VI, VIII and X and in the lateral cervical and lateral spinal nuclei. The data demonstraet that some spinal neurons project to both the PAG and the MRF via axon collaterals
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