Absent or closed EAM, commonly seen with microtia, results in conductive hearing loss, failure
of the ectoderm to form into a canal, chronic EAM infections, higher risk for cholestoma, CROS
Congenital most common or
Inner ear disorders
Michel-Type: complete absence of the inner ear and auditory nerve
Mondini: most common with a partially developed cochlea that is
flattened, 1 basal coil and will present a corner audiogram
Scheibe: most frequent to occur i
Name the 4 quadrants of the TM:
The outer ear is innervated by what cranial nerves?
What results because of the pinnas C shape?
What cranial nerves innervate the TM?
What are the three layers of the TM?
What are the outer and medial aspects of the externa
Medical Audiology Quizzes Q&A
A 1st arch syndrome would affect the structure of the incus
During the 4th week of development, ectoderm invaginates to become an otic
pit and then an otic vesicle. The otic vesicle develops into the inner ear
What is lanugo?
Middle Ear Diseases
Congenital abnormalities, deformed
1st and 2nd bracheial arch abnormalities
Eustachian Tube Dysfunction
o Closed at rest, but opens passively in response to changes in atmospheric pressu
Disorders of the Auditory System
Chapter 3 Notes
Magnetic resonance imaging provides excellent visualization of facial and
the vestibular and cochlear nerves
Pathology is generally manifested as a soft tissue lesion of one of
Lesions of the b
_: Absent or closed EAM
Commonly seen with _
Aural atresia results in a _ hearing loss.
Source: failure of _ to form into a canal
Aural Stenosis: _
Supernumery Hillocks or Ear tags: _
Most commonly found anterior to tragus, commonly bilat
Medical Audiology Syndromes
Normal hearing present at birth
Bilateral, high-frequency SNHL begins by late childhood and can only be detected
Normal range of hearing for humans: 20 Hz - 20,000 Hz
About 25% of patients with congenital hearing loss will have bony inner ear malformations
What does not develop properly in MICHEL DYSPLASIA?
otic vesicle (inner ear shares 1 common cavity), sometimes