CAMRT Radiography Practice Exam

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What are the three layers of matter surrounding the brain, in order from outer to inner?

  1. Dura, Arachnoid, Pia

  2. Pia, Arachnoid, Dura

  3. Arachnoid, Dura, Pia

  4. Pia, Dura, Arachnoid

The correct answer is: Dura, Arachnoid, Pia

The correct sequence of the three layers of matter surrounding the brain, from outer to inner, is Dura, Arachnoid, Pia. The dura mater is the tough, outermost layer that provides a protective barrier for the brain and spinal cord. Beneath the dura mater lies the arachnoid mater, which is a web-like structure that helps to cushion the brain and contains cerebrospinal fluid. The innermost layer is the pia mater, which is a delicate membrane that closely follows the contours of the brain and is involved in providing blood supply to the brain. This order is significant as it reflects how these layers interact with one another to provide structural support and protection to the central nervous system. Understanding the anatomy of these protective layers is crucial for radiographers, as it aids in recognizing various conditions that may affect the brain and surrounding tissues in imaging studies.

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