7.2.2 Ear Diseases Flashcards
What is mixed hearing loss?
Mixed Hearing Loss
- Combination of CHL & SNHL
- Damage in the outer/middle ear AND in the inner ear/auditory nerve
Type of pathology of TM?
Atelectasis
Caused by negative pressure due to Eustachian tube dysfunction
What is the embyonic orgin of the pinna of the ear?
Hillocks of His
First arch (1-3)
Second arch (4-6)
What are the adult derivatives of the 1st, 2nd, and 3rd hillocks of His
- Tragus
- Helical Crus
- Helix
What is CHL?
Conductive Hearing Loss (CHL)
- Sounds is not easily sent through the ear canal to the eardrum and the tiny bones of the middle ear
- Makes sounds softer and less easy to hear
- Can be corrected medically or surgically
Conditions?
Left: Atresia
Right: Otitis Externa (Superficial infection of the skin of the EAC with two common initiating events: moisture trapping or trauma to the EAC )
What are the derivates of the 1st and 2nd arch found in the middle ear?
Ossicles (malleus, incus, stapes)
Tensor tympani
Stapedius
What are some characteristics of the EAC?
What is a surgical option for a 9 mo healthy infant w/ history of 4 episodes of AOM since birth. HPI pos for acute fever, tugging at ears, nasal congestion, rhinorrhea. Passes NBHS, no NICU. PE pos for erythematous and bulging tympanic membrane
Ear tubes
Type of pathology of TM?
Serous Otitis
What are the two regions of the tympanic membrane/
Pars Tensa (3 layers) & Pars flaccia (2 layers)
Condition?
Microtia
Congenital deformity where the pinna is underdevleoped (Most common major anomaly)
Conditions?
Left: ‘Lop’ Ear
Right: ‘Cup’ Ear
Type of pathology of TM?
Cholesteatoma
Pars Flaccida
Benign skin cyst caused by longterm trapping of skin cells in retraction pocket