I'm reminded of S4 with Sikozu and the Grudeks harvesting leviathan toubray (neural tissue) from a vast cavern of indentations. What counts as neural tissue for a leviathan? Moya can feel pain throughout her body, so nerve endings, nerves.
Given her very different shape to humanoid bodies, what if in S1 they had instead established that she has many conduits through her, tip-to-tail, rather than a single channel like the humanoid neck to easily block/cut? Erm, the show would have ended very quickly, but it's an interesting idea.