Which set correctly lists the meninges from outermost to innermost?

Which set correctly lists the meninges from outermost to innermost?

• A. Dura mater, Arachnoid membrane, Pia mater
• B. Pia mater, Dura mater, Arachnoid
• C. Arachnoid, Pia, Dura
• D. Dura, Pia, Arachnoid

Answer: (A)

The protective coverings of the brain are arranged in a specific order: the outermost layer is the dura mater, a tough, fibrous sheath that lines the inside of the skull. Beneath that is the arachnoid membrane, a thin, web-like layer that creates the subarachnoid space where cerebrospinal fluid flows and where many blood vessels run. The innermost layer is the pia mater, a delicate membrane that closely adheres to the brain’s surface and follows its contours. Because of this structure, the correct sequence from outermost to innermost is dura mater, arachnoid membrane, then pia mater.

The protective coverings of the brain are arranged in a specific order: the outermost layer is the dura mater, a tough, fibrous sheath that lines the inside of the skull. Beneath that is the arachnoid membrane, a thin, web-like layer that creates the subarachnoid space where cerebrospinal fluid flows and where many blood vessels run. The innermost layer is the pia mater, a delicate membrane that closely adheres to the brain’s surface and follows its contours. Because of this structure, the correct sequence from outermost to innermost is dura mater, arachnoid membrane, then pia mater.