Direction of nerve impulse is reversed in nerve with

Options

A. Axo-axonic
B. Axo-dendritic
C. Axo- axondendritic
D. None of the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Nerve Impulses**: Nerve impulses are electrical signals that travel along the axon of a neuron. They are crucial for communication within the nervous system.

2. **Identifying the Options**: The question provides four options:
- Exoexonic
- Exodendritic
- Exoexodendritic
- None of the above

3. **Defining Exoexonic**: The term "exoexonic" refers to a type of synapse where the axon of one neuron connects to the axon of another neuron. This is significant because it indicates a direct interaction between two axons.

4. **Mechanism of Impulse Reversal**: In an exoexonic junction, the neurotransmitter is released from the presynaptic axon and binds to receptors on the postsynaptic axon. This can lead to a reversal in the direction of the nerve impulse, allowing for modulation of the signal.

5. **Comparison with Other Options**:
- **Exodendritic**: This refers to synapses where the axon connects to the dendrite of another neuron. The direction of the impulse is not reversed in this case.
- **Exoexodendritic**: This involves connections between axons and dendrites, and similarly does not reverse the direction of the impulse.

6. **Conclusion**: Based on the definitions and mechanisms discussed, the correct answer to the question is **exoexonic**, as it is the only type that allows for the reversal of nerve impulse direction.

**Final Answer**: The direction of nerve impulse is reversed in nerve with **exoexonic**.

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