Osseous spiral lamina

[TA] a double plate of bone winding spirally around the modiolus, dividing the spiral canal of the cochlea incompletely into two regions, the scala tympani and scala vestibuli; between the two plates of this lamina, the fibers of the cochlear nerve reach the spiral organ (of Corti). SYN: lamina spiralis ossea [TA], spiral plate.

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