TRUE about corpus callosum is/are? 1. Unite far area of two side of brain 2. Connect two frontal lobe 3. Unite two hemispheres 4. Superiorly related to indusium griseum 5. Co-ordinates activities of two hemispheres
**Core Concept**
The corpus callosum is a thick bundle of nerve fibers connecting the two hemispheres of the brain, facilitating communication and coordination between them. It is the largest white matter structure in the brain, playing a crucial role in integrating sensory, motor, and cognitive functions.
**Why the Correct Answer is Right**
The corpus callosum unites the two hemispheres, allowing for the exchange of information and coordination of activities between them. This is achieved through the interconnection of millions of axons, which transmit signals between the hemispheres. The corpus callosum is particularly important for tasks that require the integration of sensory information from both hemispheres, such as recognizing objects or understanding spatial relationships.
**Why Each Wrong Option is Incorrect**
* **Option A:** While the corpus callosum does connect areas of the brain on opposite sides, saying it "unites far area of two side of brain" is vague and inaccurate, as it specifically connects the two hemispheres.
* **Option B:** The corpus callosum connects the two hemispheres, not just the frontal lobes. It interconnects multiple regions, including the parietal, temporal, and occipital lobes.
* **Option C:** This statement is partially true but incomplete. While the corpus callosum does unite two hemispheres, it is not the only structure to do so. The anterior commissure and hippocampal commissure also connect the hemispheres.
* **Option D:** The indusium griseum is a thin layer of gray matter located above the corpus callosum, but it is not superiorly related to it. The correct relationship is that the indusium griseum lies above the corpus callosum, not superior to it.
**Clinical Pearl / High-Yield Fact**
Damage to the corpus callosum, such as in callosal syndrome, can lead to difficulties with interhemispheric communication, resulting in problems with tasks that require the integration of sensory information from both hemispheres.
**Correct Answer:** 3. Unite two hemispheres