The bones of the braincase are largely inaccessible but a small inner ear opening, the "recessustympanicus dorsalis", is visible.
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The pyramid and adjoining part of therecessusellipticus are perforated by a number of holes (macula cribosa superior).
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It is globular in form and lies in therecessussphricus near the opening of the scala vestibuli of the cochlea.
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On the underside of the braincase there is a well-developed depression, the "recessusbasisphenoidalis".
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On the upper wall or roof there is a transversely oval depression, therecessusellipticus, separated from the recessus sphricus by the crista vestibuli already mentioned.
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