a branch of the glossopharyngeal nerve that innervates the baroreceptors in the wall of the carotid sinus and the chemoreceptors in the carotid body. SYN: ramus sinus carotici nervi glossopharyngei (CN IX) [TA], ramus sinus carotici [TA], carotid sinus branch, carotid sinus nerve, Hering sinus nerve, intercarotid nerve, nerve to carotid sinus, sinus nerve of Hering.