Basivertebral Foramen

[UPDATED] The basivertebral foramen is an opening  in the posterior aspect of each vertebra (click on the picture for a larger image) which allows the exit of the basivertebral veins. These foramina can be single (as seen in the image) or multiple. The basivertebral veins represent a communication that allows drainage of the vertebral body venous sinuses into the extensive complex venous network of the internal venous plexuses that surrounds the spinal cord.

Photography by D.M.Klein

Thoracic vertebra, posterior view