Hearing and Vision (HEARING PORTION) Flashcards
Exam 2
What happens to the external ear?
Auricle wrinkles and sags
Increased cerumen production
Hearing:
What does a dry canal lead to?
Pruritis
Hearing:
Increased cerumen production with age: What kind? Why does increased cerumen occur?
Hard cerumen
Decreased apocrine gland activity –> accumulation
Hearing:
Internal ear:
What occurs?
Atrophy of organ of Corti and cochlear neurons
Loss of sensory hair cells
Degeneration of the stria vascularis
Age-Related Changes That Affect Hearing
How are sounds coded?
Sounds are coded according to intensity and frequency
Age-Related Changes That Affect Hearing
Intensity or amplitude reflects what? How is it measured?
Intensity or amplitude reflects loudness or softness of sound; measured in decibels (dB)
Age-Related Changes That Affect Hearing
Sounds at what levels are considered ototoxic?
Sounds louder than 80 to 85 (dB) are considered potentially ototoxic
Age-Related Changes That Affect Hearing
What determines pitch?
Frequency determines the pitch: high or low
Age-Related Changes That Affect Hearing
The human auditory system is most sensitive to what frequencies?
The human auditory system is most sensitive to frequencies between 2,000 and 5,000 Hz. ( but is able to hear lower or higher frequencies as well)
Age-Related Changes That Affect Hearing
When are people diagnosed with high frequency hearing loss? How is it measured?
People are diagnosed with high frequency hearing loss if they are unable to hear sounds between 2,000 Hz and 8,000 Hz, which is measured on an audiogram
Structure of the Ear and age-related changes
Where does hearing begin?
Hearing begins with external ear
Structure of the Ear and age-related changes
What are the three main parts of the ear?
External ear
Middle ear
Inner ear
Structure of the Ear and age-related changes
External ear: Pinna
Pinna: cartilaginous structure
Structure of the Ear and age-related changes
External ear: Pinna- what does it not do?
Does not affect the change in conduction of sound
Structure of the Ear and age-related changes
External ear: Auditory canal- what is it made up of?
Auditory canal: covered with skin, lined with hair follicles, and cerumen-producing glands
Structure of the Ear and age-related changes
External ear: Cerumen
Aging increases the potential for cerumen accumulation—complaint is hearing loss No additional s/s, painless.
Structure of the Ear and age-related changes
Middle ear: What is included in it?
Tympanic membrane:
Structure of the Ear and age-related changes
Middle ear:
Tympanic membrane: What is it?
separates outer and middle ear
Structure of the Ear and age-related changes
Middle ear:
Tympanic membrane: What does it do?
transmit sound energy and protect middle and inner ear
Structure of the Ear and age-related changes
Middle ear:
Tympanic membrane: How do sound vibrations pass?
Sound vibrations pass through tympanic membrane to three auditory ossicles
Structure of the Ear and age-related changes
Middle ear:
What can interfere with transfer of sound vibrations?
Calcification of the bones can interfere with transfer of sound vibrations.
Structure of the Ear and age-related changes
Middle ear:
Sound vibrations pass through tympanic membrane to three auditory ossicles. Calcification of the bones can interfere with transfer of sound vibrations.
What are the three things?
Malleus
Incus
Stapes
Structure of the Ear and age-related changes
Middle ear:
With age, what happens?
Middle ear muscles and ligaments become weaker and stiffer with age -weakens protection from loud noises
Structure of the Ear and age-related changes
Inner ear:
Where are vibrations transmitted?
vibrations transmitted to cochlea
Structure of the Ear and age-related changes
Inner ear:
Age-related changes: What is there a loss of?
Loss of hair cells and neurons
Few hair cells and neurons
Structure of the Ear and age-related changes
Inner ear:
Age-related changes: What is there reduction of?
Reduction of blood supply
Structure of the Ear and age-related changes
Inner ear:
Age-related changes: What is there a decrease in? What is a degeneration of?
Decreased basilar membrane flexibility
Degeneration of spiral ganglion
Structure of the Ear and age-related changes
Inner ear:
Age-related changes: What is there a diminution of?
Diminution of endolymph production
Structure of the Ear and age-related changes
Any degeneration of the inner ear structures will lead to what?
Any degeneration of the inner ear structures will lead to hearing loss
Structure of the Ear and age-related changes
Ototoxic medication: What do they do?
Affect the sensory cells in the inner ear that detect sound and motion
Auditory Nervous System
What is it affected by?
Affected by age-related changes