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Reference.org
Cervical plexus
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<p>The cervical plexus is a <a href="/facts/Plexus/m7yyz8Dz">nerve plexus</a> of the <a href="/facts/Anterior_rami/cFDEvFyy">anterior rami</a> of the first (i.e. upper-most) four <a href="/facts/Cervical_spinal_nerve/qBQyUIKh">cervical spinal nerves</a> C1-C4. The cervical plexus provides motor innervation to some muscles of the neck, and the <a href="/facts/Thoracic_diaphragm/aw7KcUou">diaphragm</a>; it provides sensory innervation to parts of the head, neck, and chest. </p>