Rolandic Anatomy
Cervical Plexus
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Network of ventral rami from spinal nerves C1–C4 located deep to the sternocleidomastoid. Provides sensory innervation to neck and shoulder skin and motor supply to diaphragm via the phrenic nerve. Injury can cause diaphragmatic paralysis or neck sensory deficits. Alias: C1–C4 nerve plexus.
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