![]() ![]() no significant relationship between presence of tinnitus and presence or position of vascular loops vis-a-vis the auditory portion of the VIII nerve.a low proportion (one-third) of subjects with abnormal calorics (a test of the vestibular system).spontaneous nystagmus (a vestibular sign) in 14 of the 15 subjects.good, symmetrical, word recognition performance in both ears.the already-established hearing loss on the side with the vascular loop.Complete audiovestibular work-ups on those patients revealed: One study looked at 15 patients with unilateral (one-sided) or asymmetrical hearing loss and/or tinnitus who had imaging of the CPA suspected acoustic neuroma but were found to have vascular loops instead. Yet, into this bottleneck extra vascular AICA anomalies in the CPA can nudge and impose, “ suspected of causing hearing loss, tinnitus, and vertigo” due to “ the complex interaction between the vascular loop and eighth cranial nerve, in which the loop exerts pressure on the nerve, and the nerve compromises inner ear circulation.” The Traffic Jam: Injuries But No Fatalities Talk about a traffic jam! No room left at all now. Speaking of extras, the facial nerve also goes through that corridor, though it’s not shown in figure 1. That doesn’t leave much room for error or extras. The connecting corridor - called the internal auditory meatus - protects the blood and nerve supplies while linking the ear and vestibular system to the brain. In actuality, all three pass through a short ( about 1 mm) narrow little corridor ( about 3.5 mm) that nature drilled into the temporal bone before entering the brain proper in what’s called the cerebellopontine angle (CPA). That’s just a visual so you can see how they lie inside the skull. In Figure 1, the artery and two nerve branches appear wrapped in a little cylinder. The result is the same if the blood supply is compromised due to injury, space occupying lesion, disease, or anatomical anomaly. Notice how it “shares” a narrow passage way with the vestibular and acoustic branches of the VIII cranial nerve. Figure 1 shows the system with the blood supply shown in red. We mention that artery because it is the blood supply for the inner ear, which includes hearing and vestibular (balance) systems. Vascular loops are anatomical anomalies of the anterior inferior cerebellar artery (AICA). Blood supply to peripheral auditory-vestibular system. ![]()
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