Pars tensa and tympanicomalleal joint: proposal for a new anatomic classification

Area of Science:

• Anatomy
• Otolaryngology
• Surgical Innovation

Background:

• The tympanic membrane (TM) is a key component of the ear's anatomy.
• Its precise classification and relationship with surrounding structures warrant further investigation.
• Understanding these connections is crucial for auditory function and surgical interventions.

Purpose of the Study:

• To re-evaluate the anatomical classification of the tympanic membrane (TM), tympanic bone, and malleus.
• To propose a novel anatomical classification based on their interconnectedness.

Main Methods:

• A cadaveric study involving human heads and fresh temporal bones.
• Dissection and examination of the external acoustic meatus (EAM), TM, and middle ear structures.
• Comprehensive review of medical literature on ear anatomy, embryology, histology, and phylogeny.

Main Results:

• The osseous portion of the EAM is primarily formed by the tympanic bone.
• The TM separates the external ear from the middle ear, which houses the sound-conducting ossicles (malleus, incus, stapes).
• Anatomical dissection and literature review support the proposal of a new
• Tympanicomalleal joint
• classification.

Conclusions:

• The TM may function as part of a joint, potentially improving sound transmission and middle ear protection.
• Recognizing the TM as part of a joint could lead to advancements in reconstructive ear surgery techniques.