Lesser occipital nerve (C2 nerve root) innervates the superior posterior cutaneous surface of the auricle and the cutaneous surface of the mastoid
Great auricular nerve (C2-C3 nerve roots) innervates the skin overlying the parotid gland, the external acoustic meatus, and the lower surface of the ear
Transverse cervical nerve (C2-C3 nerve roots) innervates the anterior and lateral aspects of the neck with ascending and descending branches
Supraclavicular nerve (C3-C4 nerve roots) innervates the skin above and below the clavicle, the sternoclavicular joint (medial branch), and the acromioclavicular joint (lateral branch)
