Select the incorrect statement in the following.

Options

A. Multipolar neurons are found in the cerebral cortex.
B. Unipolar neurons have cell body with one axon only .
C. The myelinated nerve fibres are enveloped with Schwann cells .
D. The postsynaptic neurons are filled throughout with neurotransmitters- containing vesicles .

Answer

To solve the question of selecting the incorrect statement from the provided options, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Multipolar neurons are found in the cerebral cortex."
- **Explanation:** Multipolar neurons have many dendrites and a single axon. They are indeed found in the cerebral cortex and the spinal cord. This statement is **correct**.

2. **Analyze the Second Statement:**
- **Statement:** "Unipolar neurons have cell body with one axon only."
- **Explanation:** Unipolar neurons consist of one axon that branches into two parts, with no true dendrites. This statement is **correct**.

3. **Analyze the Third Statement:**
- **Statement:** "Myelinated nerve fibers are enveloped with Schwann cells."
- **Explanation:** Schwann cells form the myelin sheath around myelinated nerve fibers. They are also present in unmyelinated fibers but do not form a myelin sheath in those cases. This statement is **correct**.

4. **Analyze the Fourth Statement:**
- **Statement:** "Post synaptic neurons are filled throughout with neurotransmitters containing vesicles."
- **Explanation:** Neurotransmitters are stored in vesicles within the pre-synaptic neurons, not the post-synaptic neurons. The post-synaptic neurons have receptors that bind to the neurotransmitters released from the pre-synaptic neurons. Therefore, this statement is **incorrect**.

### Conclusion:
The incorrect statement is **the fourth statement**: "Post synaptic neurons are filled throughout with neurotransmitters containing vesicles."

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