In the lower part of the first turn a second bony lamina, the " secondary spiral lamina ", projects inward from the outer wall of the bony tube; it does not, however, reach the primary osseous spiral lamina, so that if viewed from the vestibule a narrow fissure, the vestibule fissure, is seen between them.
2.
In the lower part of the first turn a second bony lamina, the " secondary spiral lamina ", projects inward from the outer wall of the bony tube; it does not, however, reach the primary osseous spiral lamina, so that if viewed from the vestibule a narrow fissure, the vestibule fissure, is seen between them.
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