Which statement is incorrect regarding spinal reflex?

Options

A. These are polysynaptic or monosynaptic reflex.
B. Urgency is required.
C. Response is only given by spinal cord.
D. There is no involvement of brain in sensory perception.

Answer

To determine which statement is incorrect regarding spinal reflexes, let's analyze the options provided step by step.

### Step 1: Understand the Types of Reflexes
- **Monosynaptic Reflex**: This type of reflex involves a single synapse between a sensory neuron and a motor neuron. An example is the knee-jerk reflex.
- **Polysynaptic Reflex**: This type involves one or more interneurons between the sensory and motor neurons, allowing for more complex responses. An example is the withdrawal reflex.

**Hint**: Remember the difference between monosynaptic and polysynaptic reflexes. Monosynaptic involves one synapse, while polysynaptic involves multiple.

### Step 2: Analyze Each Statement
1. **Statement 1**: "These are polysynaptic or monosynaptic reflex."
- This statement is correct. Spinal reflexes can indeed be either polysynaptic or monosynaptic.

**Hint**: Check if the statement accurately describes the nature of spinal reflexes.

2. **Statement 2**: "Urgency is required."
- This statement is also correct. Spinal reflexes are typically rapid responses to stimuli, indicating urgency in the response mechanism.

**Hint**: Consider the speed and necessity of reflex actions in response to stimuli.

3. **Statement 3**: "Response is only given by the spinal cord."
- This statement is misleading. While the spinal cord is responsible for the reflex action, the brain is involved in processing sensory information and perception.

**Hint**: Reflect on the role of the brain in sensory perception and reflex actions.

4. **Statement 4**: "There is no involvement of the brain in sensory perception."
- This statement is incorrect. The brain plays a crucial role in sensory perception, even if the reflex action occurs at the spinal cord level.

**Hint**: Think about how sensory information is processed in the nervous system.

### Conclusion
The incorrect statement regarding spinal reflexes is:
- **"Response is only given by the spinal cord."** This is incorrect because the brain is involved in sensory perception.

### Final Answer
The incorrect statement regarding spinal reflex is: "Response is only given by the spinal cord."