External veins of the spinal cord it the Wistar rats.

In 54 Wistar rats the number, diameter, and topography of veins on the ventral and dorsal surfaces of the spinal cord were investigated. The spinal cord in rats possesses well developed venous net forming meningeal venous system. The veins pass independently of arteries and they consists of single trunks with intervals passing on the ventral and dorsal surfaces of the spinal cord as well as dorsal and ventral radicular veins draining to the epimeningeal venous plexus.