A non- medullayedbaxon does not have

Options

A. Schwann cells.
B. nodes of Ranvier.
C. axolemma.
D. neurofibrils

Answer

### Step-by-Step Solution:

1. **Understanding Axon Structure**:
- An axon is a long, slender projection of a neuron that conducts electrical impulses away from the neuron's cell body. Axons can be either myelinated (medullated) or unmyelinated (non-medullated).

2. **Defining Non-Medullated Axons**:
- Non-medullated axons lack a myelin sheath, which is a protective layer that insulates the axon and speeds up the transmission of electrical signals.

3. **Identifying Key Components**:
- The myelin sheath is produced by Schwann cells in the peripheral nervous system. In non-medullated axons, these myelin sheaths are absent.

4. **Understanding Nodes of Ranvier**:
- Nodes of Ranvier are gaps in the myelin sheath where the axon membrane is exposed. They facilitate rapid signal transmission via saltatory conduction. In non-medullated axons, since there is no myelin sheath, Nodes of Ranvier are also absent.

5. **Conclusion**:
- Therefore, in non-medullated axons, the key component that is not found is the **Nodes of Ranvier**.

### Final Answer:
A non-medullated axon does not have **Nodes of Ranvier**.

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