Skeletal system: Tympanic plexus Symmetrical or not? Medial to the pyramids of the temporal bones, in the first row, on both sides of the facial canal. Gossip? Attached to the annulus fibrosus of the round window. Function? Sound mediation and transmission of irritation from the retina to the medulla oblongata through the peripheral auditory neural field. Group of cranial nerves? Vestibular The main route of damage? Displacement of the temporal bone pyramid, the presence of pathology of the auditory system. X-ray sign? An important acoustic step.