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Anatomy of the Ear

Anatomy 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...

Physical Assessment of the Respiratory Tract IV: Auscultation

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.

The Auditory Ossicles

The 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...

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

Assessing Body Temperature - Tympanic membrane

Assessing Body Temperature - Tympanic membrane

Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...

Assessment of the Cardiovascular System IV: Auscultation

Assessment of the Cardiovascular System IV: Auscultation

Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.

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Related Experiment Video

Updated: May 10, 2026

Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique

Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique

Published on: May 23, 2021

[Eustachian tube function tests: an update].

E F N Di Martino¹

¹HNO Klinik des DIAKO Hospital Bremen, Gröpelinger Heerstr. 406-8, 28355, Bremen, Deutschland. e.dimartino@diako-bremen.de

|June 6, 2013

Summary

Assessing Eustachian tube (ET) function involves diverse methods, but no single test is universally accepted. Further research is needed to establish a definitive gold standard for accurate ET function evaluation.

Area of Science:

Otolaryngology
Medical Diagnostics

Context:

Eustachian tube (ET) dysfunction impacts ear health.
Accurate assessment of ET function is crucial for diagnosis and treatment.
Current diagnostic methods vary in efficacy and application.

Purpose:

To review and evaluate diverse methods for assessing Eustachian tube (ET) function.
To identify the strengths and limitations of various diagnostic techniques.
To highlight the need for a standardized, gold standard ET function test.

Summary:

Multiple clinical tests, including tympanometry, manometry, and MRI, are used for ET function assessment.
Endoscopy, radiography, and pressure chambers offer insights but have limitations.
Sonotubometry shows promise for broader clinical use, yet no single method captures all aspects of ET function.

Related Experiment Videos

Last Updated: May 10, 2026

Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique

Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique

Published on: May 23, 2021

The majority of studies indicate that a single, valid method for ET testing is currently unavailable.

A universally accepted gold standard for ET function testing has yet to be established.

Impact:

Informs clinicians about the current landscape of ET function testing methods.
Guides future research towards developing and validating a gold standard test.
Aims to improve diagnostic accuracy and patient outcomes for ET-related conditions.