osseous spiral lamina


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os·se·ous spi·ral lam·i·na

[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).

os·se·ous spi·ral lam·i·na

(os'ē-ŭs spī'răl lam'i-nă) [TA]
A double plate of bone winding spirally around the modiolus dividing thespiral canal of the cochlea incompletely into two, scala tympani and scala vestibuli; between the two plates of this lamina the fibers of the cochlear nerve reach the spiral organ (organ of Corti).
References in periodicals archive ?
One contact of each pair was oriented on the medial side of the electrode carrier toward the position of the spiral ganglion, and the second contact was oriented on the upper surface of the carrier toward the osseous spiral lamina or basilar membrane.
For the purpose of this study, a specimen was considered to have severe trauma if any portion of the electrode had deviated from the ST into the scala media or scala vestibuli with associated fracture of the osseous spiral lamina, tearing of the basilar membrane, or dislocation of the spiral ligament.
As we and others [43] have observed, vertical deflection of the array resulting in penetration of the basilar membrane and/or osseous spiral lamina may still occur with the AOS technique with the latest Cochlear Contour array.