Foramina

In anatomy, a foramen (/fəˈreɪmən/; pl. foramina, /fəˈræmᵻnə/) is any opening. Foramina inside the body of humans and other animals typically allow muscles, nerves, arteries, veins, or other structures to connect one part of the body with another.

The skulls of vertebrates (including humans) have foramina through which nerves, arteries, veins and other structures pass.

Within the vertebral column (spine) of vertebrates, including the human spine, each bone has an opening at both its top and bottom to allow nerves, arteries, veins, etc. to pass through.

...
Wikipedia