1. A vein that accompanies the vertebral vein but passes through the foramen of the transverse process of the 7th cervical vertebra and empties into the brachiocephalic vein
   "The accessory vertebral vein provides an alternative route for venous drainage of the neck";
   - vena vertebralis accessoria

Derived forms: accessory vertebral veins

Type of: vein, vena, venous blood vessel