Cervical spinal nerve 4, also calledC4, is aspinal nerve of thecervical segment. It originates from thespinal cord above the4th cervical vertebra (C4). It contributes nerve fibers to thephrenic nerve, themotor nerve to thethoracoabdominal diaphragm. It also provides motor nerves for thelongus capitis,longus colli,anterior scalene,middle scalene, andlevator scapulae muscles.^{[citation needed]} C4 contributes some sensory fibers to thesupraclavicular nerves, responsible for sensation from the skin above theclavicle.^[1] C4 and C5 are the areas that see the highest amount of cervical spine trauma.^[2]

Cervical spinal nerve
The plan of the cervical and brachial plexuses.
The spinal cord with spinal nerves.
Details
Identifiers
Latin	nervi spinalis
FMA	6445
Anatomical terminology [edit on Wikidata]

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  Cervical spinal nerve 4
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  Projectional radiograph of a man presenting with pain by thenape and left shoulder, showing a stenosis in theintervertebral foramen of cervical spinal nerve 4, corresponding with the affecteddermatome.