Transcript Which portion of the temporal bone houses the vestibular labyrinth?

Which portion of the temporal bone
houses the vestibular labyrinth?
a)
b)
c)
d)
Squamosa
Mastoid
Petrous
Tympanic
C) The vestibular labyrinth is housed in a portion of the otic capsule in the petrous portion
of the temporal bone.
The horizontal SCC lies parallel to:
a)
b)
c)
d)
zygoma
line connecting the lobule to the lateral brow
line connecting the tragus to the nasal tip
line connecting the eac to the lateral canthus
D) The horizontal canals lie parallel to the line between the external auditory canal and
the outer canthus of the eye, which is inclined 30-degrees above the horizontal axis plane.
Which SCC enters the vestibule with
an unpaired unampulated end?
a)
b)
c)
d)
Lateral
Posterior
Superior
Inferior
A) The nonampulated ends of the posterior and superior SCC join to form the common
crus and enter the vestibule posteromedially.
You press the gas in your car, which
structure is signals the position
change?
a)
b)
c)
d)
Lateral SCC
Superior SCC
Utricle
Saccule
C) The saccule is perpendicular to the utricle. The sensitivity of the translational
acceleration is greatest in the plane of the macula. Thus, the utricular macula is sensitive
in the horizontal plane, and the saccular macula is sensitive in the sagittal plane.
Kinocilium distinguishes a vestibular
hair cell from a cochlear hair cell.
Which of the following statements is
true?
a) Stereocilia may or may not accompany kinocilia.
b) Hair cell activity changes based on kinocilia
displacement.
c) Displacement in the direction of kinocilia causes
excitation of the hair cell.
d) Neighboring hair cell kinocilia arrangement varies,
improving the sensitivity of the end organ.
C) Figure 130.6
These cells are thought to produce the
ionic composition of endolymph:
a)
b)
c)
d)
Dark Cells
Pigmented Cells
Chalice Hair Cells
Deiters’ Cells
A) These dark cells are located directly above the pigmented cells and are thought to
produce the ionic composition of the endolymph.
After 2 minutes of spinning at a
consistent speed, the sensation is best
described as:
a) Persistent dizziness due to persistent cupula deflection
b) No dizziness due to no cupula deflection
c) Persistent dizziness due to persistent macula
deflection
d) No dizziness due to no macula deflection
B) At 0 Hz, which corresponds to constant-velocity rotation, the torsion-pendulum model
predicts there will be no response [of the cupula] at all.
The crystals of the otolith organs are
composed of what?
a)
b)
c)
d)
Calcium Phosphate
Calcium Oxalate
Calcium Carbonate
Uric Acid
C) The mass is composed of calcium carbonate crystals known as otoconia
The striola runs the length of the
mucula. Why is it important?
a) Due to its large efferent innervation, it is important for
central feedback.
b) Due to its midline position, it is important for sensing
magnitude.
c) Due to mainly being composed of type I hair cells, it is
important for sensation of slight movements.
d) It is not more important than the rest of the surrounding
macula.
B) It is from an array of these hair cells that the brain can estimate the magnitude and
direction of linear acceleration… the orientation of the hair cells on either side of the
striola is roughly 180 degrees out of phase.
Tilt-translational ambiguity describes
the sensation in which airplane pilots:
a) Feel like they are heavier during descent.
b) Feel like they are leaning to one side during
take-off.
c) Feel like they are accelerating when turning.
d) Feel like they are reclining when accelerating.
D) Fighter pilots taking off from an aircraft carrier deck at NIGHT will feel as if they are
tilted backwards during forward acceleration. The natural correction for this feeling is to
steer the plane downward, which could result in disaster.
Which one is NOT a type of vestibular
afferent?
a)
b)
c)
d)
Calyx
Scarpa
Bouton
Dimorphic
B) Based on the anatomy of peripheral termination, there are three distinct vestibular
afferent types: calyx, dimorphic, and bouton.
Vestibular afferent neurons have their
cell bodies where?
a)
b)
c)
d)
Within the otic capsule
Within the IAC
Within the Brainstem
Afferents do not have cell bodies
B) Vestibular afferents are bipolar neurons that have cell bodies in the inferior and
superior scarpa ganglion (Figure 130.11)
The inferior vestibular nerve sends
afferents from which structure?
a)
b)
c)
d)
Vertical SCC
Horizontal SCC
Saccule
Utricle
C) The inferior division includes neurons from the posterior (inferior) canal and saccule.
The process which stabilizes gaze
during motion is mostly controlled by
which?
a)
b)
c)
d)
Purkinje cell projections
Ascending tract of Deiters
Vestibular commissural system
Medial longitudinal fasciculus
D) The dominant output of the vestinular nuclei are to the ocular motor nuclei via the
medial longitudinal fasciculus (and the ascending tract of Dieters!).
The resident most likely to spend the
rest of their lives listening to dizzy
patients is?
a)
b)
c)
d)
Ashley
Audrey
Bonnie
Mia
ALL OF THE ABOVE