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garri49 [273]
3 years ago
11

Sympathetic nerves may leave the spinal cord at which vertebra?

Biology
1 answer:
alisha [4.7K]3 years ago
7 0

Answer:

<u>b. first thoracic</u>

Explanation:

Sympathetic nervous system is<u> one of the divisions of the autonomic nervous system</u>. The other divisions are <u>parasympathetic nervous system</u> and <u>enteric nervous system</u>.

Autonomic nervous system is composed of <u>preganglionic neurons</u> and <u>postganglionic neurons.</u>

Similarly, the sympathetic nervous system is composed of postganglionic and preganglionic neurons.

The cell bodies of<u> preganglionic neurons of sympathetic nervous system is found in intermediolateral cell columns of spinal cord segments T-T12 and L1-2 or 3</u>. Therefore, sympathetic nervous system is also called <u>thoracolumbar division.</u>

The cell bodies of parasympathetic nervous system are found in the <u>brainstem  nuclei which exit via cranial nerves 3, 7, 9, 10 and also in the sacral spinal cord segements S2-4</u>, therefore parasympathetic nervous system is also known as <u>craniosacral division.</u>

<u>QUESTION:</u>

<u>b. first thoracic</u>

<u>This is the correct answer choice as sympathetic nervous system cell bodies are found in intermediolateral cell column of T1-12 and L1-2 or 3 spinal cord segments. Hence, a sympathetic nerve is most likely to leave via first thoracic vertebra.</u>

<u>Third lumbar is less likely as sympathetic nervous system does not extend to this level in every individual.</u>

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