Final answer:
The dura mater, arachnoid mater, and pia mater do not become spinal nerves, cauda equina, filum terminale, or conus medullaris as they exit the intervertebral foramen but continue to protect the exiting spinal nerves.
Step-by-step explanation:
As the meninges, specifically the dura mater, arachnoid mater, and pia mater, exit the intervertebral foramen, they do not directly become any particular structure. Instead, they continue to provide protective layers for the spinal nerves that emerge from the spinal cord. The cauda equina refers to a collection of nerve roots that extends from the lumbar and sacral spine, resembling a horse's tail. The filum terminale is a fibrous extension of the pia mater that anchors the spinal cord to the coccyx. The conus medullaris is the tapered end of the spinal cord itself. Therefore, the protective meninges are associated with the spinal nerves as they pass through the intervertebral foramen but do not become any of these listed structures.