Select the incorrect statement.

Options

A. The cerebral hemispheres are connected by a tract of nerve fibres called the corpus callosum.
B. The cerebrum wraps around a structure called thalamus, which is a major coordinating centre for sensory and motor signaling.
C. The hypothalamus contains a number of centres which control body temperature, urge for eating and drinking.
D. The cerebral cortex contains motor areas, sensory areas and large regions that are both sensory and motor in function

Answer

To solve the question of selecting the incorrect statement about the nervous system, particularly focusing on the forebrain and its components, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding the Structure of the Brain**:
- The brain is divided into several parts, with the forebrain being one of the main divisions. The forebrain consists of the cerebrum, thalamus, and hypothalamus.

2. **Analyzing the Statements**:
- **Statement 1**: "The cerebral hemispheres are connected to a tract of nerve fibers called corpus callosum."
- This statement is **correct**. The corpus callosum is indeed the structure that connects the left and right cerebral hemispheres.

- **Statement 2**: "Cerebrum is wrapped around a structure called thalamus."
- This statement is also **correct**. The thalamus is located beneath the cerebrum and is surrounded by it.

- **Statement 3**: "Below the thalamus, we get a structure called hypothalamus."
- This statement is **correct**. The hypothalamus is located below the thalamus and plays a crucial role in homeostasis.

- **Statement 4**: "In our cerebral cortex, there are motor areas, sensory areas, and many such large regions which carry out both sensory and motor functions."
- This statement is **incorrect**. While the cerebral cortex does contain distinct motor and sensory areas, there are also association areas that are responsible for complex functions such as memory and intelligence, which do not fall under strictly sensory or motor categories.

3. **Conclusion**:
- After analyzing all the statements, we find that the fourth statement is incorrect. Therefore, the answer to the question is that **Statement 4 is the incorrect statement**.

### Final Answer:
**The incorrect statement is Statement 4.**

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