Select the incorrect statement. with respect to the forebrain

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 regarding the incorrect statement about the forebrain, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Understanding the Forebrain**:
- The forebrain consists of several important structures, including the cerebrum, thalamus, and hypothalamus. The cerebrum is the largest part of the brain and is responsible for higher brain functions.

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

3. **Analyzing Statement 2**:
- **Statement**: "The cerebrum wraps around a structure which is called as thalamus."
- **Analysis**: This statement is also correct. The thalamus is located beneath the cerebrum and is involved in sensory and motor signal relay and the regulation of consciousness and sleep.

4. **Analyzing Statement 3**:
- **Statement**: "The hypothalamus is a major endocrine gland and controls body functions such as temperature and hunger."
- **Analysis**: This statement is correct. The hypothalamus plays a crucial role in maintaining homeostasis, including regulating body temperature, hunger, and thirst.

5. **Analyzing Statement 4**:
- **Statement**: "The cerebral cortex contains motor areas, sensory areas, and areas that are neither sensory nor motor."
- **Analysis**: This statement is incorrect. While the cerebral cortex does contain motor and sensory areas, the areas that are neither sensory nor motor are known as association areas. These areas integrate sensory information and are involved in higher cognitive functions, but they are not classified strictly as sensory or motor.

### Conclusion:
The incorrect statement among the options provided is **Statement 4**.