One thing has always bothered me about the Ceti Eels--how did they get to Terrell and Chekov's brains without totally destroying their inner ears?
That must have been the case. What I'm interested in is how they would have gotten past the inner ear, at all. I imagine some combination of acidic saliva and/or powerful mandibles would have allowed them to get past the eardrum and connecting bones and thus gain access to the cerebrum.
There's a scene (maybe two, one for Chekov and another for Terrill) that show a razor-like tongue-like appendage that the eels whip out (from presumably their mouths) to cut a slice in the flesh on the outer ear area. So at least on their ingress, they don't just waddle through the ear canal but burrow through some skin/flesh. They may just avoid most of the inner ear components on their way to the cerebral cortex.
Doesn't appear Chekov's hearing was too adversely affected, Khan spoke in fairly quiet to normal levels to him during the call to Regula 1 scene.
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