The majority of these nerves Handle the features of your upper extremities and enable you to come to feel your arms, shoulder, and again of your head.  Every nerve provides sensation to a particular space of your body called a dermatome.  I've tentatively edited my answer to acknowledge your contributions; https://tituslsydh.ourabilitywiki.com/10145862/examine_this_report_on_emg_diagnosis_neck_headache_singapore