What is the starting material that best completes the following reaction? 
Definitions:
Middle Ear
The section of the ear between the eardrum and the inner ear, containing the ossicles that transmit sound vibrations.
Tympanic Membrane
The thin layer separating the outer ear from the middle ear, which vibrates in response to sound waves.
Surgical Repair
A medical procedure aimed at restoring the function or appearance of a part of the body.
Bony Labyrinth
A complex system of channels and cavities within the temporal bone of the skull, important for hearing and balance.
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