AEMCA Practice Exam

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Which of the following lists the layers of the meninges from outermost to innermost correctly?

  1. Pia, Arachnoid, Dura

  2. Dura, Arachnoid, Pia

  3. Arachnoid, Dura, Pia

  4. Pia, Dura, Arachnoid

The correct answer is: Dura, Arachnoid, Pia

The layers of the meninges consist of three distinct membranes that encase the brain and spinal cord, serving protective and supportive functions. The correct order from outermost to innermost is Dura mater, Arachnoid mater, and Pia mater. The Dura mater is the toughest and most outer layer, providing a strong protective shield. Beneath the Dura lies the Arachnoid mater, which has a web-like structure and forms a space that contains cerebrospinal fluid. The Pia mater is the innermost layer, closely adhering to the surface of the brain and spinal cord, supplying nutrients and containing blood vessels. Understanding this sequence is crucial for delineating the anatomy of the central nervous system and is foundational knowledge for fields such as medicine, neuroscience, and related disciplines.

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