What does TM mobility indicated by compliance difference at peak and +200 daPa measure?

TM mobility, indicated by compliance difference at peak and +200 daPa, specifically measures static compliance. Static compliance refers to the measure of how well the tympanic membrane (TM) moves in response to changes in air pressure within the ear canal. When assessing a tympanogram, the compliance value is highest at the point where the pressure is equal on both sides of the TM, typically seen at or around atmospheric pressure.

The compliance difference observed between the peak compliance and the measurement taken at +200 daPa helps identify the maximum movement of the TM. A significant difference suggests that the TM is more or less compliant, indicating how well the middle ear system is working. Therefore, this measure is crucial for diagnosing conditions affecting the middle ear, such as fluid presence or Eustachian tube dysfunction.

The other options focus on different aspects of auditory function or anatomy. Inner ear function pertains to structures and mechanisms beyond the tympanic membrane, auditory processing refers to how the brain interprets sound, and middle ear pressure specifically relates to the pressure equilibrium rather than the mobility of the TM itself. Static compliance as the correct answer directly links to the functional assessment of the TM's movement.