Phrenic Nerve
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http://tkdtutor.com/07Defense/EffectsOfBlows.htm
Effects of Blows
Excerpt:
"Blow to Throat
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Blow to the phrenic nerve that runs from the fourth cervical vertebra down into the chest, the thorax, to merge with the diaphragm may cause it the diaphragm to spasm and cause a feeling of getting the "wind knocked out" of you.
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Blow to Back of Neck
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Blow to the phrenic nerve, that leads to the diaphragm between the second and forth vertebra, may sever it and cause death due to respiratory paralysis. The nerve may be easily injured.