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Eye Movements > Ch 10: Kinematics > Flashcards

Ch 10: Kinematics Flashcards

1
Q

cardinal direction of gaze
medial rectus
MR

A

nasal

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2
Q

cardinal direction of gaze
lateral rectus
LR

A

temporal

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3
Q

cardinal direction of gaze
superior rectus
SR

A

superior from temporal

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4
Q

cardinal direction of gaze
inferior rectus
IR

A

inferior from temporal

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5
Q

cardinal direction of gaze
superior oblique
SO

A

inferior from nasal

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6
Q

cardinal direction of gaze
inferior oblique
IO

A

superior from nasal

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7
Q

primary and subsidiary actions of
medial rectus
MR

A

adduction

no subsidiary

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8
Q

primary and subsidiary actions of
lateral rectus
LR

A

abduction

no subsidiary

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9
Q

primary and subsidiary actions of
superior rectus
SR

A

primary: supraduction
subsidiary: incycloduction, adduction

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10
Q

primary and subsidiary actions of
inferior rectus
IR

A

primary: infraduction
subsidiary: excycloduction, adduction

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11
Q

primary and subsidiary actions of
superior oblique
SO

A

primary: incycloduction
subsidiary: infraduction, abduction

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12
Q

primary and subsidiary actions of
inferior oblique
IO

A

primary: excycloduction
subsidiary: supraduction, abduction

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13
Q

how many diagnostic positions of gaze are there? how many of these are cardinal?

A

9 diagnostic positions of gaze

6 are cardinal

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14
Q

what does the ORBIT program stimulate?

A

a Hess test

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15
Q

according to Hering’s law, how does the Hess test diagnose?

A
  • underaction in the cardinal direction of gaze

- yoke muscle in the other eye shows an overreaction

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16
Q

sherrington’s law states

A

any signal to an agonist to contract is accompanied by an equivalent inhibition of the antagonist muscle
(only relates to muscles of one eye)

17
Q

what does Hering’s law state?

A

that corresponding muscles in the two eyes receive equal excitatory and inhibitory signals
(law relates to binocular eye movements)

18
Q

what is paresis

A

a partial immobility of a muscle

19
Q

what is strabismus

A

an observable deviation of the lines of sight from the point of regard

20
Q

the observed deviation of the eyes is called the

A

primary deviation

21
Q

when the eye with the paretic muscle attempts to fixate, an excessive excitatory signal is required by the paretic muscle, which is also sent to the corresponding muscle in the normal eye. this leads to a much greater deviation of the two eyes called the

A

secondary deviation

Eye Movements (7 decks)

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