specific immunoreactivity was demonstrated in histological sections of spinal cord , in ventral and dorsal horn cells and nerve fibres , in the meningeal layer , the ependymal lining of the central canal , and in the endothelium of the ventral spinal artery and other blood vessels . beta-endorphin immunoreactivity was also distributed widely in neurones , central and peripheral nerve fibres , and in non-neuronal cells in cultures of spinal cord tissue explanted from rat embryos 7 -- 10 days before birth .
C0459414
central canal
C0037925
spinal cord