Innervation of the tympanic membrane

Area of Science:

• Otolaryngology
• Neuroscience
• Anatomy

Background:

• Modified Vater-Pacinian corpuscles were first reported in the human tympanic membrane in 1911.
• The precise function and significance of these mechanoreceptors in the tympanic membrane remain incompletely understood.

Purpose of the Study:

• To ultrastructurally investigate the features of Vater-Pacinian corpuscles in the human tympanic membrane.
• To examine the relationship between these mechanoreceptors and Eustachian tube function.
• To explore potential neural connections between tympanic membrane sensory receptors and tubal muscles.

Main Methods:

• Ultrastructural analysis of modified Vater-Pacinian corpuscles.
• Histological examination of the tympanic membrane.
• Assessment of Eustachian tube function during Valsalva maneuvers and active equilibration.
• Evaluation of tympanic membrane anesthesia effects on Eustachian tube function.

Main Results:

• Ultrastructural features of the corpuscles are comparable to known mechanoreceptors.
• Corpuscle location suggests a role in detecting tympanic membrane stiffness due to dislocation.
• Following tympanic membrane anesthesia, 13 out of 40 ears required more than two swallows for equilibration, indicating altered Eustachian tube function.

Conclusions:

• The findings support the role of modified Vater-Pacinian corpuscles as mechanoreceptors in the tympanic membrane.
• A potential neural connection between tympanic membrane sensory receptors and Eustachian tube muscles is suggested.
• These receptors may play a role in sensing tympanic membrane displacement and influencing tubal function.