Bone 2, right ossicular lesion.

This slide shows erosion of the long process of the incus and the exposed head of the stapes, thus there is ossicular discontinuity.
The horizontal part of the facial nerve is pink and  lies medial to the long process and superior to the stapes.
If you would like to learn how to surgically remedy this type of deafness please see the Dissection Manual which can be freely downloaded from the “Free Offers”  part of the website.