Cervical Plexus
The Cervical plexus (plexus cervicalis) is formed by the ventral rami of the upper four cervical nerves and the upper part of fifth cervical ventral ramus. The network of rami is located deep within the neck. The cervical plexus innervates muscles of the neck and areas of skin on the head, neck and chest. The deep branches innervate muscles, while the superficial branches supply areas of skin. A long branch (C4; nervus phrenicus) innervates muscles of the diaphragm. Communications with cranial nerves vagus nerve and hypoglossal nerve (nervus vagus et nervus hypoglossus) exist.
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