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Examination #3
Dental Neuroscience (NSci 6110/5110)
Tuesday, April 1, 2008
Instructions: Complete the name and identification block of the answer sheet. Choose the
single best answer for each of the 20 questions listed below and mark the answer sheet
accordingly. If you dispute the validity of a question, or wish to otherwise qualify your answer,
do so in writing on the sheet provided (the last page of these questions (page 6)). We will take
into account such qualifications prior to establishing the final version of the "Key". In order for
your written qualifications to be considered, they must be turned in with your answer sheet,
and you must identify yourself by printing your name and ID number on the qualification sheet.
1.
Axons of
form the optic nerve.
*
a.
b.
c.
d.
e.
2.
Which of the following statements is TRUE? Photoreceptors (rods and cones)
*
a.
b.
c.
d.
e.
rods
cones
ganglion cells
bipolar cells
a and b
are depolarized in darkness.
generate action potentials.
use only one photopigment.
do not contain synaptic vesicles.
None of the above.
3.
Which of the following statement is FALSE regarding the lateral geniculate nucleus
(LGN)?
*
a.
b.
c.
d.
e.
The magnocellular division is involved in motion perception.
The parvocellular division is involved in color perception.
The magnocellulr division is involved in visual acuity.
The LGN sends axons to the visual cortex.
None of the above.
4.
Which of the following statements is TRUE? The object recognition processing stream
in the visual cortex
*
a.
b.
c.
d.
e.
receives input from the magnocellular division of the LGN.
receives input from the parvocellular division of the LGN.
is involved in motion detection.
is contained in the primary visual cortex (V1 or striate cortex) only.
receives its input from Meyer’s loop only.
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5.
*
6.
*
Which of the following structures is NOT found in the inner ear?
a.
b.
c.
d.
e.
cochlea
hair cells
organ of Corti
ossicles
None of the above
Which of the following statements is FALSE regarding the hair cell stereocilia?
a.
b.
c.
d.
e.
Bending of stereocilia towards the tallest stereocilium causes excitation.
The degree of deflection of the stereocilia is related to pitch.
Ion channels are located on the stereocilia.
Stereocilia on a hair cell are connected by tip links.
All of the above.
7.
A lesion to the superior olivary nucleus will result in
*
a.
b.
c.
d.
e.
8.
Which of the following structures is NOT part of the core auditory pathway?
*
a.
b.
c.
d.
e.
a deficit in sound localization.
a loss in the ability to discriminate sound intensity .
a loss in the ability to discriminate pitch.
all of the above.
none of the above.
Dorsal cochlear nucleus.
Medial geniculate body in thalamus.
Inferior colliculus.
Primary auditory cortex.
Ventral cochlear nucleus
9.
Which of the following structures is NOT an element of the central neural circuit that
mediates olfaction?
**
10.
a.
the olfactory bulb
b.
the lateral olfactory tract
c.
the glomerulus
d.
the periamygdaloid cortex
e.
the insular cortex
Which of the following statements concerning olfactory receptors is FALSE?
2
**
a.
b.
c.
d.
e.
Each odorants binds to a single olfactory receptor.
Olfactory receptors are G-protein coupled.
Activation of olfactory receptors can produce depolarization by opening
Na+ channels.
A single olfactory receptor is located on each olfactory neuron.
Thousands of olfactory receptors exist in the olfactory epithelium.
11.
The clinical term used to describe a reduced sense of taste is
**
a.
b.
c.
d.
e.
12.
Which cranial nerve innervates the taste buds located in the soft palate?
**
a.
b.
c.
d.
e.
13.
Afferents in the vestibular nerve
**
a.
b.
c.
d.
e.
ageusia
anosmia
hypoosmia
dysgeusia
hypogeusia
facial
vagus
glossopharangeal
trigeminal
hypoglossal
increase their activity in response to head rotation, but not head tilt.
are damaged in Benign Paroxymal Positional Nystagmus.
increase their activity in response to low frequency sound.
increase their activity in response to angular acceleration.
project directly to the oculomotor neurons to control eye movemen
14.
The otolithic membrane is
**
a.
b.
c.
d.
e.
15.
During a hangover following alcohol intoxication, vertigo is
a group of hair cells in the otolithic organs.
a highly vascularized membrane in the semicircular canal.
a membrane containing calcium carbonate crystals.
b and c only.
all of the above.
3
**
a.
b.
c.
d.
e.
the sensation that the world is spinning.
due to the semicircular canals inappropriately responding to head tilt.
a result of the cupula "floating" in the surrounding endolymph.
a and b only.
all of the above.
16.
The vestibular-ocular reflex (VOR) controls eye movements in response to head
rotation. When the head rotates to the left in the horizontal plane, the eyes move in the
opposite direction to provide a stable visual target. Functional components of the VOR include
**
a.
b.
c.
d.
e.
contraction of the left medial rectus muscle.
increased activity in the left facial nerve.
relaxation of the right lateral rectus muscle.
activation of hair cells in the saccule.
none of the above.
17.
In the section of the midbrain/thalamus shown, the arrow points to the
**
a.
b.
c.
d.
e.
medial geniculate nucleus.
substantia nigra.
lateral geniculate nucleus.
medial lemniscus.
superior colliculus.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
18.
In the section of the midbrain shown below, the arrow points to the
4
**
a.
b.
c.
d.
e.
superior colliculus.
inferior colliculus.
superior olivary nucleus.
cochlear nucleus.
medial geniculate nucleus.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
19. Which of the following structures is NOT an element of the central neural circuit that
mediates audition?
**
a.
b.
c.
d.
e.
superior colliculus
cochlear nucleus
medial geniculate nucleus
transverse temproal gyrus
superior olivary nucleus
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20.
**
In the section of the pons shown below, the arrow points to the
a.
b.
c.
d.
e.
trapezoid body
superior olivary nucleus
medial geniculate nucleus
medial lemniscus
inferior colliculus
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
6
Qualifications to Answers or Disputed Questions
Question # ___. The answer I chose was ____. I take issue with this question on the
following grounds:
Question # ___. The answer I chose was ____. I take issue with this question on the
following grounds:
Question # ___. The answer I chose was ____. I take issue with this question on the
following grounds:
Use back of page if additional space is required
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