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Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
Published on: August 18, 2023
Bone conduction in a three-dimensional model of the cochlea
Frank Bohnke1, Wolfgang Arnold
1Department of Otorhinolaryngology, Klinikum rechts der Isar, Technical University Munich, Munich, Germany. frank.boehnke@lrz.tum.de
ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|October 27, 2006
Summary
This study confirms that removing the stapes footplate increases bone conduction sensitivity. Finite element modeling also validated psychoacoustic findings on the cancellation of air- and bone-conducted sound.
Area of Science:
- Audiology
- Biomedical Engineering
- Otoacoustic Emissions
Background:
- Sound conduction involves both air and bone pathways, with biological tissues playing a role.
- Understanding bone conduction is crucial for audiology and middle ear pathology.
- Previous research by Bárány described psychoacoustic effects of bone conduction, including sound cancellation.
Purpose of the Study:
- To investigate the influence of bone conduction on hearing sensations.
- To validate clinical findings regarding bone conduction sensitivity during middle ear surgery.
- To confirm psychoacoustic observations using a finite element model.
Main Methods:
- A finite element model was developed to simulate sound conduction.
- The model was subjected to harmonic pressure signals at the cochlea wall.
- Simultaneous stimulation of the cochlea wall and phase-reversed stapes footplate stimulation were performed.
Main Results:
- The finite element model confirmed that removing the footplate increases bone conduction sensitivity.
- The model's simulations corroborated Bárány's findings on the cancellation of air- and bone-conducted sound.
- The study provides insights into unsolved audiology problems.
Conclusions:
- Finite element modeling is a valuable tool for studying audiology and middle ear mechanics.
- The findings contribute to a better understanding of bone conduction mechanisms.
- This research offers potential solutions for audiology and middle ear pathology.
Related Concept Videos
01:13The Cochlea
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.
01:22Hair Cells
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
01:15Auditory Pathway
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 the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:16Anatomy of the Ear
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...
01:11The Auditory Ossicles
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...
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
01:24Bone Formation by Endochondral Ossification
Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...