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Schematic drawing of the deep cervical plexus and superficial cervical plexus. (A) Four superficial branches of the cervical plexus are depicted using yellow color, and deep branches of cervical plexus (ansa cervicalis) are depicted using green color. The cervical plexus is known to anastomose with several cranial nerves and the sympathetic trunk. (B) The superficial cervical plexus emerges behind the posterior border of the SCM (sternocleidomastoid) muscle and innervates the head, neck, and shoulder areas. The illustration is adapted from Restrepo et al. [52].