What are the functions of the greater auricular nerve?

The greater auricular nerve is primarily responsible for providing sensory innervation to the skin over the parotid gland, the external ear, and parts of the scalp. It arises from the cervical plexus, specifically from the second and third cervical nerves (C2 and C3). Additionally, it contributes to the sensation of the auricle and the skin in the area around the ear. Its role is crucial in conveying sensory information from these regions to the central nervous system.