The adult ear canal
curves like a vertical figure "S"
is usually straight
rises upwards and forward, then descends to the drum
descends downward then backward toward the drum
The isthmus is
where the canal narrows to enter the temporal bone
another name for the aperture
located at the second bend of the canal
the area between the first and second bend
The pinna and the external canal together
all of the above
gather and reinforce acoustical signals
with the irregular shape of the auricle, cause increases and decreases
forms the resonating tube
The average resonant frequency of the ear canal plus concha is:
2700Hz
1500 HZ
3500HZ
1000HZ
The dividing line between the external ear and the middle ear is the
tympanic membrane
malleus
eustachian tube
oval window
The ear canal contains
cilia, ceruminous glands, sebaceous glands
ceruminous glands, pinna scaffoid fossa
umbo, isthmus, sebaceous glands
crus, aperture, sebaceous glands
Which of the following terms is not part of the tympanic membrane
crus
par tensa
pars flaccida
umbo
An otoscopic insprection should reveal:
a view of the pearly white tympanic membrane
an external auditory canal sloping upward and backward
no vision of any oddicles
a clear view of the Vagus Nerve (Xth Cranial)
Which of the following is part of the pinna
tragus
interragal
triangular fossa
The Vagus Nerve (Xth Crainal) is found:
along the bottom of the ear canal
along the bottom of the tympanic membrane
along the bottom of the interregnal notch
at the top of the isthmus.
