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The sympathetic nerves in mammals arise from

1. sacral nerves
2. cervical nerves
3. thoraco-lumbar nerves
4. 3rd, 7th, 9th and 10th cranial nerves

Correct answer: thoraco-lumbar nerves

Solution

The sympathetic nervous system has a thoracolumbar outflow, meaning its preganglionic neurons arise from spinal cord segments in the thoracic and upper lumbar regions. That is why the correct choice is thoraco-lumbar nerves.

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