The pharyngeal recess/Eustachian tube complex forms an acoustic passageway

摘要

We propose that the complex formed by the Pharyngeal Recess and Eustachian Tube, acts as an acoustic passageway for sounds originating inside the body: sounds made by one's voice, breathing, mastication, one's heartbeats. The antagonistic effect of two sets of muscles, one innervated by the trigeminal nerve, the other by the vagal nerve and cervical plexus, enables the body to modulate transmission of sound via this passageway and hence modulate the awareness of body sounds. Impairment of this system can be due to local factors, such as adhesions over the pharyngeal recess or inflammation inside the pharyngeal recess and/or Eustachian tube; or to tensions of the muscles involved, related to other causes. Dysfunction of the system can lead to symptoms related to increased or decreased awareness of body sounds, such as autophony, hearing of pulsating sounds and clicks in the ear; sensory symptoms related to increased activation of the nerves such as fullness feeling in the ear, facial pain, burning mouth syndrome, globus pharyngeus, pharyngeal pain; and symptoms related to inappropriate muscular contraction such as masticatory and cervical muscle tensions, bruxism, and tension type headache. The functioning of this acoustic passageway is related to the concept of the Trigeminocervical complex. The concept of Vagocervical complex is proposed.