Falx cerebri contains:
**Core Concept**
The falx cerebri is a fold of meningeal tissue that separates the two hemispheres of the brain, playing a crucial role in cerebral structure and function. This dural fold is a key component of the brain's protective covering, containing blood vessels and nerves.
**Why the Correct Answer is Right**
The falx cerebri is primarily composed of the dura mater, a tough, fibrous membrane that envelops the brain and spinal cord. It contains the superior sagittal sinus, a major venous structure that collects cerebrospinal fluid and blood from the brain. The falx cerebri also contains bridging veins, which supply blood to the cerebral cortex.
**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect, as it does not accurately represent the primary composition of the falx cerebri.
* **Option B:** Incorrect, as it is a different structure that also contains the superior sagittal sinus, but is not a fold of meningeal tissue.
* **Option C:** Incorrect, as it is not a component of the falx cerebri.
**Clinical Pearl / High-Yield Fact**
The falx cerebri can be affected in conditions such as subdural hemorrhage, where bleeding occurs between the dura mater and the brain.
**Correct Answer: D. Dura mater.**