Which of the following statement about neuron is incorrect ?

Options

A. Dendrites are afferent fibres
B. Oligodendrocytes form myelin sheath around the axons in PNS
C. Neuroglia are common source of tumours
D. Schwann cells form myelin sheath around the axons in the PNS

Answer

To determine which statement about neurons is incorrect, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Analyze Option 1**:
- The statement is: "Dendrites are the afferent fibers."
- Dendrites are indeed afferent fibers as they receive signals and transmit impulses toward the cell body of the neuron.
- **Conclusion**: This statement is **correct**.

2. **Analyze Option 2**:
- The statement is: "Oligodendrocytes form myelin sheath around the axons in the peripheral nervous system."
- This statement is incorrect because oligodendrocytes are responsible for forming the myelin sheath around axons in the **central nervous system (CNS)**, not the peripheral nervous system (PNS). In the PNS, Schwann cells perform this function.
- **Conclusion**: This statement is **incorrect**.

3. **Analyze Option 3**:
- The statement is: "Neuroglia are the common source of tumors."
- This statement is correct. Neuroglia, or glial cells, can indeed be a source of tumors, known as gliomas.
- **Conclusion**: This statement is **correct**.

4. **Analyze Option 4**:
- The statement is: "Schwann cells form the myelin sheath around the axons in the peripheral nervous system."
- This statement is correct. Schwann cells are responsible for forming the myelin sheath around the axons in the PNS.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
The incorrect statement about neurons is **Option 2**: "Oligodendrocytes form myelin sheath around the axons in peripheral nervous system."

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