Head / Neck Flashcards
What are the primary causes of Otitis Media/Externa?
- Parasites
- Foreign bodies
- Hypersensitivity
- Keratinization disorders
- Autoimmune diseases
These factors contribute to the development of Otitis Media/Externa.
What typically leads to secondary bacterial overgrowth in Otitis Media/Externa?
Typically polymicrobial
This means that multiple types of bacteria can contribute to the condition.
Which pathogen is most commonly isolated in cases of Otitis Media/Externa?
- Staph intermedius
- Staph pseudintermedius
Both make up (70%)
This indicates the prevalence of this specific pathogen in affected cases.
List some pathologic populations associated with Otitis Media/Externa.
- Staphylococcus intermedius or pseudintermedius
- Pseudomonas aeruginosa
- Proteus mirabilis
- Escherichia coli
- Corynebacterium spp.
- Enterococcus spp.
- Streptococcus spp.
These bacteria are commonly found in infections related to Otitis Media/Externa.
Where is the Organ of Corti located?
Organ of Corti
On the basilar membrane of the cochlear duct
The organ of Corti, also known as the spiral organ, is a collection of hair cells in a dog’s inner ear that transforms sound waves into electrical impulses
What type of cells does the Organ of Corti contain?
Organ of Corti
Auditory hair cells
The organ of Corti, also known as the spiral organ, is a collection of hair cells in a dog’s inner ear that transforms sound waves into electrical impulses
What are the special sensory receptors for hearing?
Organ of Corti
Auditory hair cells
The organ of Corti, also known as the spiral organ, is a collection of hair cells in a dog’s inner ear that transforms sound waves into electrical impulses
Name some supporting cells found in the Organ of Corti.
Organ of Corti
- Inner and outer pillar cells
- Inner and outer phalangeal cells
- Border cells
- Hensen cells
What do outer hair cells do in the Organ of Corti?
Organ of Corti
Receive sound waves and transmit to inner hair cells
What transformation occurs in inner hair cells?
Organ of Corti
Transform sound into electrical impulse then to cochlear nerve
What do inner hair cells transmit to the cochlear nerve?
Organ of Corti
Electrical impulse
Where does the cochlear nerve transmit signals to?
Organ of Corti
Auditory cortex in the brain
Fill in the blank: Outer hair cells receive sound waves & transmit to inner hair cells -> inner hair cells transform into _______ & transmit to cochlear nerve.
Organ of Corti
electrical impulse
