Outer Ear Anatomy
The only portion of the pinna that is not cartilaginous.
Lobule/Ear lobe
The distance covered by one cycle of a propagating wave.
Wavelength
Where malleus attaches to TM.
umbo
The air-circulating tube that goes from the back of the nose near the adenoids to the air space in the middle ear is the _________ _________.
Eustachian Tube
The opposition to sound flow through an acoustic system.
Acoustic impedance
The most common form of skin cancer caused by excessive sunlight exposure.
Basal cell carcinoma
A very small PINNA which may be a result of a congenital malformation is known as __________ .
Microtia
Identify one cause of a perforated Tympanic Membrane.
Direct trauma, sudden pressure in the EAC, changes in pressure, pressure build up
A rounded prominence in the medial wall of tympanic cavity formed by the lateral projection of the basal turn of the cochlear.
Promontory
____________ Matching is accomplished through the leverage action of the ossicular chain and the size difference between the TM and the oval window.
Impedance
Embryologically, the auricle forms out of the _________________ arches which develop after 28 days from conception.
Pharyngeal
An entirely absent PINNA is known as ________ .
Anotia
The tube that is surgically inserted into the TM to help equalize pressure between the outer and middle ear.
Pressure equalization (PE) tube
The Eustachian Tube is normally kept closed, but opens during ______________ .
yawning, sneezing, swallowing
The muscle within the middle ear, innervated by CN VII (Facial nerve), that causes the STAPES to move sideways and tenses the oval window membrane thus reducing the amount of vibration.
Stapedius
When viewing a healthy tympanic membrane, the light reflection visible is known as the _______ __ ______.
Cone of Light
The lack of canalization that may affect the cartilaginous portion, the bony portion, or both is called ___________ .
Atresia
The use of the otoscope to examine the tympanic membrane may be a challenge due to the _____ of the EAC.
shape/curvature
The window of the middle ear that connects the middle ear space with the inner ear is the ______ _________.
Oval Window
The contraction of middle ear muscles that helps reduce the intensity of a sudden loud sound.
Acoustic reflex
True/False
Atresia can be treated with hearing aids.
True
A cyst of squamous epithelium forms in the middle ear or mastoid as a consequence of TM retraction.
cholesteatoma
The lenticular process of the incus connects to the head of the __________ .
Stapes
The muscle within the middle ear that inserts into the manubrium of the malleus that contracts so that the TM becomes more tense is the __________ ________ and it is innervated by CN ___. (Trigeminal)
Tensor Tympani
CN V