Which word means a surgical incision into the cranium to expose the brain tissue?

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Craniotomy is a surgical procedure that involves making an incision into the cranium to expose the brain tissue for surgical intervention. Rhizotomy is a surgical procedure that involves cutting nerve roots to alleviate pain. Laminectomy is a surgical procedure that involves removing a part of the vertebral bone to access the spinal cord. Biopsy is a procedure that involves removing a small sample of tissue from the body for diagnostic purposes.

Which Word Means a Surgical Incision into the Cranium to Expose