carotid sinus nerve carotid sinus nerve the carotid branch of the glossopharyngeal nerve (carotid sinus nerve or hering's nerve) is a small branch of the glossopharyngeal nerve (cranial nerve ix) that innervates the carotid sinus, and carotid body. branch of glossopharyngeal nerve to carotid sinushypoglossal nerve, cervical plexus and their branches (nerve not labeled, but region is visible)detailsfromglossopharyngeal nerveidentifierslatinramus sinus carotici nervi glossopharyngeita98a14.2.01.146ta26327fma53488anatomical terms of neuroanatomy anatomy course and relations it runs downward anterior to the internal carotid artery. it communicates with the vagus nerve and sympathetic trunk before dividing in the angle of the bifurcation of the common carotid artery to innervate the carotid body, and carotid sinus. function it conveys information from the baroreceptors of the carotid sinus to the vasomotor center in the brainstem (in order to mediate blood pressure homeostasis), and from chemoreceptors of the carotid body (mainly conveying information about partial pressures of blood oxygen, and carbon dioxide).