| 1 |
Arithmetical centre of the visible portion of stapes |
Left extremity of the cochlear nerve window |
Left extremity of the cochlear nerve window |
| 2 |
Arithmetical centre of the visible portion of incus |
Right extremity of the cochlear nerve window |
Right extremity of the cochlear nerve window |
| 3 |
Joint between periotic and tympanic (left) |
Arithmetical centre of the basal cochlear turn canal |
Cochlear aqueduct |
| 4 |
Joint between periotic and tympanic (right) |
Arithmetical centre of the apical cochlear turn canal |
Arithmetical centre of the tympanic duct apical cochlear turn |
| 5 |
Outer side of the cochlear wall |
Arithmetical centre of the basal cochlear turn canal |
Arithmetical centre of the vestibular duct apical cochlear turn |
| 6 |
Innerside of the cochlear wall |
Arithmetical centre of the facial nerve canal |
Arithmetical centre of the vestibular duct basal cochlear turn |
| 7 |
Begin of interscalar septum |
Head of malleus |
Arithmetical centre of the tympanic duct basal cochlear turn |
| 8 |
End of interscalar septum |
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| 9 |
Posterior intersection between tympanic and periotic bone |
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