Final answer:
The transverse foramen is found in the cervical vertebrae, which contain specific openings in their transverse processes to allow the passage of an artery that supplies the brain.
Step-by-step explanation:
The transverse foramen is a feature that is found in the cervical vertebrae. Typical cervical vertebrae, like C4 or C5, have several distinct characteristics including a small body, a bifid (Y-shaped) spinous process, and transverse processes that are curved (U-shaped) to allow for the passage of cervical spinal nerves. Each transverse process has a specialized opening known as a transverse foramen, through which an important artery that supplies the brain ascends the neck. Therefore, the group of vertebrae that contain the transverse foramen is the cervical group.