What characterizes the pars flaccida of the tympanic membrane?

What characterizes the pars flaccida of the tympanic membrane?

• A. It is the thickest part of the TM
• B. It is located in the lower 4/5 of the TM
• C. It is the upper 1/5 of the TM and flaccid
• D. It is rigid and supports sound conduction

Answer: (C)

The pars flaccida of the tympanic membrane, also known as the eardrum, is specifically characterized by being located in the upper portion, comprising about 1/5 of the total surface area of the membrane. Its name, “flaccida,” aptly describes its relatively loose and thin structure compared to the surrounding parts of the tympanic membrane, particularly the pars tensa, which is thicker and more rigid. The flexibility of the pars flaccida plays a role in accommodating pressure changes within the ear, but it does not contribute significantly to sound conduction as effectively as the pars tensa does. Thus, option C accurately captures both its location and its distinctive flaccid nature.

The pars flaccida of the tympanic membrane, also known as the eardrum, is specifically characterized by being located in the upper portion, comprising about 1/5 of the total surface area of the membrane. Its name, “flaccida,” aptly describes its relatively loose and thin structure compared to the surrounding parts of the tympanic membrane, particularly the pars tensa, which is thicker and more rigid. The flexibility of the pars flaccida plays a role in accommodating pressure changes within the ear, but it does not contribute significantly to sound conduction as effectively as the pars tensa does. Thus, option C accurately captures both its location and its distinctive flaccid nature.