Sulcus spiralis internus

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Sulcus spiralis internus
Floor of ductus cochlearis.
Gray's p.1055
Anatomical terminology

On the upper plate of that part of the lamina which is outside the vestibular membrane, the periosteum is thickened to form the limbus laminæ spiralis, this ends externally in a concavity, the sulcus spiralis internus, which represents, on section, the form of the letter C.

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This article incorporates text from a public domain edition of Gray's Anatomy.