Auditory Canal
Auditory Canal - Related Videos
07:40
Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis
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Cited by 13 •
2017
We present a protocol to isolate the auditory bulla, capsule, and ossicles from postnatal mice for whole mount and histological analysis.
10:50
Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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Cited by 6 •
2014
Functional studies of the auditory system in mammals have traditionally been conducted using spatially-focused techniques such as electrophysiological recordings. The following protocol describes a method of visualizing large-scale patterns of evoked hemodynamic activity in the cat auditory cortex using functional magnetic resonance imaging.
10:14
In Ovo Electroporation in the Chicken Auditory Brainstem
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Cited by 6 •
2017
Auditory brainstem neurons of avians and mammals are specialized for fast neural encoding, a fundamental process for normal hearing functions. These neurons arise from distinct precursors of embryonic hindbrain. We present techniques utilizing electroporation to express genes in the hindbrain of chicken embryos to study gene function during auditory development.
10:13
A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds
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Cited by 14 •
2012
We describe the design and assembly of miniaturized headphones suitable for replacing a songbird’s natural auditory feedback with a manipulated acoustic signal. Online sound processing hardware is used to manipulate song output, introduce real-time errors in auditory feedback via the headphones, and drive vocal motor learning.
02:22
Measuring the Auditory Brainstem Response in Mice
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2025
Source: Lee, D., et. al. Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage. J. Vis. Exp. (2023)This video demonstrates the measurement of auditory brainstem response (ABR) in a mouse. Electrodes are placed on the head, behind the ear, and near the tail of an anesthetized mouse. Acoustic stimuli at various intensities are delivered, and electric signals generated are recorded as waveforms.
FAQs
Its curved, skin-lined structure supports the passage of sound toward the tympanic membrane while helping shield deeper parts of the ear. This arrangement gives the canal both a transmission role and a protective role. Structural abnormalities or other changes in the passage may therefore affect sound delivery and become relevant when clinicians investigate conductive hearing problems.
Hairs and ceruminous glands contribute to local defense within the canal. Ceruminous glands produce earwax, which traps particles before they move farther inward, while the canal’s skin-lined environment supports this protective function. Clinically, however, cerumen accumulation is important because impaction can obstruct the passage and become a finding during ear examination.
Sound must travel through the canal before reaching the tympanic membrane, so conditions that narrow, block, or alter the passage can interfere with transmission. Cerumen impaction, foreign bodies, inflammation, infection, and structural abnormalities are clinically relevant for this reason. Examining the canal helps distinguish these possible contributors when conductive hearing difficulty is being evaluated.
Otoscopy allows clinicians to examine the canal for findings that may explain symptoms or affect ear function. The assessment can identify inflammation, infection, foreign bodies, cerumen impaction, and structural abnormalities. These observations help direct clinical evaluation by showing whether a problem lies within the passage that carries sound toward the tympanic membrane.
The canal deserves focused attention when the examination must clarify possible inflammation, infection, obstruction, or structural change. Otoscopy can reveal whether a foreign body or accumulated cerumen is present and whether the passage appears abnormal. This information is especially useful when symptoms suggest impaired sound transmission or when the outer and middle ear require clinical differentiation.
The canal matters during hearing-device fitting because its shape, skin lining, and internal condition influence how a device relates to the ear. Clinicians also need to recognize cerumen, inflammation, infection, foreign bodies, or structural abnormalities that could complicate assessment. Evaluating the passage therefore supports both appropriate device fitting and interpretation of conductive hearing problems.