Sulcus spiralis internus
|Sulcus spiralis internus|
Floor of ductus cochlearis.
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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