Which root means 'lining of brain & spinal cord'?

• A. Lining of brain & spinal cord
• B. Muscle membrane
• C. Mental state
• D. Menstruation

Answer: (A)

The main idea here is understanding what a combining form refers to in medical terms. The combining form mening/o- comes from the meninges, the membranes that line and protect the brain and spinal cord. That lining is exactly what the root denotes, so this is the best match. You’ll see mening/o- in terms like meningitis or meninges, which describe conditions or structures related to those membranes. Other options point to unrelated concepts—muscle membranes, mental state, or menstruation—so they don’t fit with the CNS lining.