Final Exam Study Guide - Part 2 of 3 Flashcards
A hearing loss that is present at birth, due to genetic factors, and resulting from abnormal development of the outer and middle ear mechanisms can be classified as:
- Congenital
- Endogenous
- Peripheral
The term _______ refers to all types and degrees of hearing loss.
hearing impairment
Medical treatment or surgery to restore all or part of reduced hearing capabilities usually works with ________ types of hearing loss.
Conductive and mixed
A hearing loss that is associated with occupational and recreational noise exposure can be classified as:
- Acquired
- Exogenous
- Peripheral
Hearing sensitivity “within normal limits for an adult” is identified when pure tone audiometry findings are plotted at levels that are ____dB HL or less on the audiogram.
25
Problems in the outer, middle, and inner ear may lead to ________ hearing loss.
a mixed
The peripheral vestibular system in each ear consists of _______ sensory organs, housed with the __________ labyrinth, which is filled with _________.
- 5
- membranous
- endolymph
The lateral, most peripheral layer of the tympanic membrane arises/develops from _______ primordial/germ cells.
ectodermal
“_______” refers to a collection of anomalies or symptoms resulting from a single cause.
syndrome
both the utricle and saccule have maculae which contain sensory hair cells embedded in a gelatinous material covered with _________ or calcium carbonate crystals.
otoconia
Genetic hearing loss:
- 50-60% of all congenital SNHL
- Approx. 70% autosomal recessive pattern of inher.
- Approx. 15% autosomal dominant pattern of inher.
- Over 400 known genetic causes
The term ____________ refers to the regularity which an inherited trait is manifested in the person who carries the gene.
penetrance
The peripheral auditory system consists of all structures lateral to the _________.
Brainstem
Complete maturation of the cochlear sensory and supporting cells does not occur until the:
5th fetal month
The physical manifestation of a genetic trait is called a __________ and the actual genetic makeup that results in that trait is called a ________.
- Phenotype
- Genotype
_________ is the most extreme and rare form of an inner ear anomaly where there is no inner ear and in some cases no auditory nerve.
Michel
_____, a fluid that is high in its concentration of potassium and low in sodium, is contained in the membranous labyrinth of the inner ear.
Endolymph
Problems in the outer and/or middle ear may lead to ______ hearing loss
a conductive
The Membranous labyrinth:
- Located within the bony labyrinth
- Separated from the the bony labyrinth by perilymph fluid
- Contrains endolymph
- Contains the scala media and the sensory receptor cells for hearing
The ossicles develop from ________ primordial/germ cells.
mesoderm.
Hearing loss present at birth or acquired before the age 3-5 years is also often classified as a _________________.
Prelingual hearing loss
____________ is usually NOT treatable or reversible with medication and/or surgery.
Sensorineural hearing loss
The auricle is adult shaped by the _______ but continues to grow until about age 9.
20th fetal week
A _________ is characterized by reduction of sound loudness due to signal attenuation.
conductive hearing loss
