Final answer:
The transverse foramen is an opening found only in the transverse processes of cervical vertebrae.
Step-by-step explanation:
The transverse foramen is an opening found only in the transverse processes of cervical vertebrae. A typical cervical vertebra has U-shaped transverse processes with a transverse foramen. The function of the transverse foramen is to allow the passage of the vertebral artery and vertebral vein.