Experimental study of transient cochlear ischemia as a cause of sudden deafness

Figure 17 Sequential progression of ischemic damage in three regions of the cochlea. In the lateral region, including the stria vascularis and spiral ligament, ischemic damage occurred immediately after the insult, which recovered gradually to be almost normal on day 7. In the middle region, loss of inner hair cells progressed for the first 2-3 d; thereafter, no further deterioration occurred. In the modiolar region, damage to the spiral ganglion cell was minor for a few days, but became prominent thereafter. The vertical scale indicates grade of damage.