Cervical vertebra 4
Encyclopedia
The cervical vertebra 4 is a vertebra of the spinal column.

The cervical spinal nerve 4
Cervical spinal nerve 4
The cervical spinal nerve 4 is a spinal nerve of the cervical segment..It originates from the spinal column from above the cervical vertebra 4 .Its control of the thoracic diaphragm has inspired a medical mnemonic: "Cut C4, breathe no more."...

(C4) passes out above it.

It is also the level at which the common carotid artery bifurcates.
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