Final answer:
The next instrument needed for the removal of the lamina during a laminectomy is a Bone rongeur.
Step-by-step explanation:
The instrument needed for the removal of the lamina during a laminectomy, once the spinous process is exposed, is a Bone rongeur. A bone rongeur is a surgical instrument with a sharp, curved tip that is used to trim or remove bone. In the case of a laminectomy, it is used to remove the lamina, which is the flat part of the vertebrae's arch.