Nerve cell body of pre-ganglionic fibre of sympathetic nervous system originates from

Options

A. Brain
B. Spinal cord
C. Sympathetic chain
D. All of these

Answer

To answer the question about where the nerve cell body of the pre-ganglionic fibers of the sympathetic nervous system originates from, follow these steps:

### Step-by-Step Solution:

1. **Understand the Sympathetic Nervous System**: The sympathetic nervous system is one part of the autonomic nervous system, which is responsible for the body's 'fight or flight' responses.

2. **Identify the Types of Fibers**: There are two types of autonomic fibers: pre-ganglionic and post-ganglionic. The pre-ganglionic fibers are the first set of neurons that originate in the central nervous system and synapse with post-ganglionic neurons.

3. **Locate the Origin of Sympathetic Pre-ganglionic Fibers**: The pre-ganglionic fibers of the sympathetic nervous system specifically originate from the thoracolumbar region of the spinal cord. This includes spinal segments T1 to L2.

4. **Conclusion**: Therefore, the nerve cell body of the pre-ganglionic fibers of the sympathetic nervous system originates from the spinal cord.

### Final Answer:
The nerve cell body of the pre-ganglionic fibers of the sympathetic nervous system originates from the spinal cord.

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