**Core Concept:** The dura mater is a tough outer layer of the three protective membranes (meninges) surrounding the brain and spinal cord. It receives its blood supply primarily from the pia mater, not the meninges themselves.
**Why the Correct Answer is Right:** The correct answer (D) states that the dura mater receives its blood supply from the pia mater, not the meninges. The pia mater is the inner layer of the meninges and is directly in contact with the cerebral cortex, allowing it to better supply the brain tissue. The dura mater, being the outer layer, relies on collateral blood vessels from the pia mater.
**Why Each Wrong Option is Incorrect:**
A. False: The dura mater does receive blood supply from both the pia mater and the arachnoid mater (the middle layer of meninges).
B. False: The dura mater relies on the arachnoid mater for its blood supply, not the pia mater.
C. False: The dura mater receives blood supply from itself, which is not possible in the context of the meninges.
**Clinical Pearl / High-Yield Fact:** Understanding the blood supply of the dura mater and its relationship with the pia mater is crucial for understanding the anatomy and physiology of the central nervous system. This relationship allows for efficient nutrient and waste exchange between the meninges and the brain tissue. A proper understanding of this can help in interpreting various neurological symptoms and signs related to meningeal involvement and intracranial hemorrhages.
**Correct Answer:** D. False: The dura mater receives its blood supply from the pia mater, not the meninges themselves.
Free Medical MCQs Β· NEET PG Β· USMLE Β· AIIMS
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