Sulcus spiralis internus
|Sulcus spiralis internus|
|Floor of ductus cochlearis.|
|Gray's||subject #232 1055|
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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