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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Auditory Pathway01:15

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Updated: Mar 3, 2026

Discovering Middle Ear Anatomy by Transcanal Endoscopic Ear Surgery: A Dissection Manual
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Tubotympanic system functioning.

C Martin1, A Karkas1, J-M Prades1

  • 1Service ORL et de Chirurgie Cervico-Faciale, Hôpital Nord, CHU de Saint-Étienne, 42055 Saint-Étienne Cedex 2, France.

European Annals of Otorhinolaryngology, Head and Neck Diseases
|May 3, 2017
PubMed
Summary
This summary is machine-generated.

The tubotympanic system, comprising the Eustachian tube and tympanomastoid cavities, maintains middle ear pressure primarily through mucosal gas diffusion. This review clarifies its functions, crucial for understanding chronic otitis development.

Keywords:
Auditory tubeEustachian tubeTubotympanic mucosa histologyTubotympanic system physiology

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Area of Science:

  • Otolaryngology
  • Middle Ear Physiology
  • Anatomy

Background:

  • The Eustachian tube and tympanomastoid cavities form a unified tubotympanic system.
  • Previous research on its function is complex and sometimes contradictory.
  • A clear overview is needed to understand tubotympanic system dysfunction and chronic otitis.

Purpose of the Study:

  • To review the current understanding of the tubotympanic system's functioning.
  • To provide a foundation for comprehending tubotympanic system dysfunction.
  • To explore the development of chronic otitis in relation to this system.

Main Methods:

  • Literature review of existing studies on the tubotympanic system.
  • Analysis of the anatomical and functional continuity of the system.
  • Examination of the role of mucosa in middle ear function.

Main Results:

  • The tubotympanic system is lined by a continuous mucosa with specialized areas.
  • Under normal conditions, gas diffusion across the mucosa maintains middle ear pressure.
  • The Eustachian tube's aeration function is primarily active during rapid atmospheric pressure changes via reflex.
  • Other key functions include protection, clearance via mucociliary transport, and immune defense.

Conclusions:

  • The tubotympanic system's mucosal lining is critical for maintaining middle ear homeostasis.
  • Understanding normal function is essential for diagnosing and treating conditions like chronic otitis.
  • The system's multifaceted roles highlight its importance in overall ear health.