Ocular Motility Quizzes With Full Set
Correct Answers| Updated
the signal sent form the brain back to the brain about the future position and
location of the eye - Ans--the efference copy, part of the afferent system
all of the following describe characteristics of the orbital layer of muscle
EXCEPT which one? - Ans--fast fatiguing
(note: orbital layer = graded response, non-twitch fibers, high oxidative
capacity, related to the step signal)
which of the following pairs are yoked agonist muscles for left gaze? - Ans--
right medial rectus and left lateral rectus
which statement below defines the binocular field of fixation? - Ans--the
binocular field of fixation covers a smaller area than the monocular field of
fixation
cover test in left gaze shows 20 eso, in primary gaze shows 10 eso, and in
right gaze shows 4 eso. what deficit is this? - Ans--this is a left abduction
deficit
what might happen to a smooth pursuit eye movement response as a target
is suddenly moved at high velocities? - Ans--catch up saccades occur
a patient with a left hyper in primary gaze could have a hypofunction of the -
Ans--depressor muscles in the left eye or the elevator muscles in the right
eye
the purpose of having the miniature eye-movements is that they - Ans--
prevent fading of retinal images
Hering's Law - Ans--equal and simultaneous innervation is given to yoked
muscles in the two eyes
, the saccadic eye movements classified as being most reflexive - Ans--quick
phases
end gaze nystagmus results from faulty - Ans--step
what is the cardinal position of gaze for the right superior rectus - Ans--up
and to the right
the inferior oblique muscle moves the eye mainly into which direction of
gaze - Ans--up and out
T or F: normal smooth pursuit eye movements can be described as having
saccadic intrusions, a 50% gain, and a 30 degree phase shift - Ans--false
Sherrington's Law - Ans--opposite innervation is given to opposing muscles
in the SAME eye
what are both the correct antagonist muscle and the yoked agonist muscle
to the right eye's lateral rectus? - Ans--antagonist = right medial rectus
yoked agonist = left medial rectus
on versions, your patient reports diplopia in right gaze. Impaired contraction
could be found in which muscles? - Ans--right lateral rectus and left medial
rectus
smooth pursuit gain is closest to 1.0 when - Ans--eye motion closely
matches target motion
the following graph could represent which type of eye movement? - Ans--
saccades
head rotation to the left has which of the following effects on the lateral
SCC? - Ans--positive excitation of the left SCC
negative inhibition of the right SCC
the frontal cortical pathway is responsible for which type of saccades - Ans--
voluntary intentional saccades
Correct Answers| Updated
the signal sent form the brain back to the brain about the future position and
location of the eye - Ans--the efference copy, part of the afferent system
all of the following describe characteristics of the orbital layer of muscle
EXCEPT which one? - Ans--fast fatiguing
(note: orbital layer = graded response, non-twitch fibers, high oxidative
capacity, related to the step signal)
which of the following pairs are yoked agonist muscles for left gaze? - Ans--
right medial rectus and left lateral rectus
which statement below defines the binocular field of fixation? - Ans--the
binocular field of fixation covers a smaller area than the monocular field of
fixation
cover test in left gaze shows 20 eso, in primary gaze shows 10 eso, and in
right gaze shows 4 eso. what deficit is this? - Ans--this is a left abduction
deficit
what might happen to a smooth pursuit eye movement response as a target
is suddenly moved at high velocities? - Ans--catch up saccades occur
a patient with a left hyper in primary gaze could have a hypofunction of the -
Ans--depressor muscles in the left eye or the elevator muscles in the right
eye
the purpose of having the miniature eye-movements is that they - Ans--
prevent fading of retinal images
Hering's Law - Ans--equal and simultaneous innervation is given to yoked
muscles in the two eyes
, the saccadic eye movements classified as being most reflexive - Ans--quick
phases
end gaze nystagmus results from faulty - Ans--step
what is the cardinal position of gaze for the right superior rectus - Ans--up
and to the right
the inferior oblique muscle moves the eye mainly into which direction of
gaze - Ans--up and out
T or F: normal smooth pursuit eye movements can be described as having
saccadic intrusions, a 50% gain, and a 30 degree phase shift - Ans--false
Sherrington's Law - Ans--opposite innervation is given to opposing muscles
in the SAME eye
what are both the correct antagonist muscle and the yoked agonist muscle
to the right eye's lateral rectus? - Ans--antagonist = right medial rectus
yoked agonist = left medial rectus
on versions, your patient reports diplopia in right gaze. Impaired contraction
could be found in which muscles? - Ans--right lateral rectus and left medial
rectus
smooth pursuit gain is closest to 1.0 when - Ans--eye motion closely
matches target motion
the following graph could represent which type of eye movement? - Ans--
saccades
head rotation to the left has which of the following effects on the lateral
SCC? - Ans--positive excitation of the left SCC
negative inhibition of the right SCC
the frontal cortical pathway is responsible for which type of saccades - Ans--
voluntary intentional saccades
