Sympathetic nerves in mammals arise from

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(C) The sympathetic nervous system is a part of the autonomic nervous system.In mammals,the sympathetic nerves arise from the thoraco-lumbar region of

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Thoraco-lumbar region

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(C) The sympathetic nervous system is a part of the autonomic nervous system.In mammals,the sympathetic nerves arise from the thoraco-lumbar region of the spinal cord.Specifically,the preganglionic neurons originate from the lateral horns of the gray matter in the thoracic and upper lumbar segments ($T_1$ to $L_2$ or $L_3$) of the spinal cord.Therefore,the correct option is $(c)$.

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