True about Falx cerebri ?
**Core Concept**
The falx cerebri is a fold of the dura mater that separates the two hemispheres of the brain, specifically attaching to the lateral sulci of each hemisphere. It plays a crucial role in maintaining the structural integrity of the brain and facilitating the movement of cerebrospinal fluid.
**Why the Correct Answer is Right**
The falx cerebri is a part of the dura mater, a dense, fibrous membrane that envelops the brain and spinal cord. It is composed of two layers: the outer periosteal layer and the inner meningeal layer. The falx cerebri is formed by the fusion of these two layers, which creates a fold that attaches to the lateral sulci of the brain hemispheres. This attachment helps to prevent the two hemispheres from moving excessively and colliding with each other.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the falx cerebri does not attach to the corpus callosum. The corpus callosum is a thick bundle of fibers that connects the two hemispheres of the brain, but it is not directly attached to the falx cerebri.
**Option B:** This option is incorrect because the falx cerebri is not a fold of the arachnoid mater. The arachnoid mater is a layer of the meninges that lies between the dura mater and the pia mater, but it does not form the falx cerebri.
**Option C:** This option is incorrect because the falx cerebri does not separate the two hemispheres of the brain completely. While it does help to separate them, it does not create a complete partition between the two hemispheres.
**Clinical Pearl / High-Yield Fact**
The falx cerebri is a critical structure that can be affected in various neurological conditions, such as subdural hemorrhage, which can occur when there is trauma to the brain and blood accumulates between the dura mater and the arachnoid mater.
**Correct Answer:** C.