spinal veins spinal veins the spinal veins (veins of the medulla spinalis or veins of the spinal cord) are situated in the pia mater and form a minute, tortuous, venous plexus. spinal veins1: posterior spinal vein2: anterior spinal vein3: posterolateral spinal vein4: radicular (or segmental medullary) vein5: posterior spinal arteries6: anterior spinal artery7: radicular (or segmental medullary) arterydetailsdrains tointervertebral veinsidentifierslatinvenae spinalesta98a12.3.07.023fma71580anatomical terminology they emerge chiefly from the median fissures of the medulla spinalis and are largest in the lumbar region. in this plexus there are: (1) two median longitudinal veins, one in front of the anterior fissure, and the other behind the posterior sulcus of the cord. (2) four lateral longitudinal veins which run behind the nerve roots. they end in the intervertebral veins. near the base of the skull they unite, and form two or three small trunks, which communicate with the vertebral veins, and then end in the inferior cerebellar veins, or in the inferior petrosal sinuses.