Module 5: Ocular Motility & Disorders Flashcards Preview

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Flashcards in Module 5: Ocular Motility & Disorders Deck (50)
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Adducts the eye

Medial rectus

1

Elevation of the eye is the primary action. Also adducts and intorts.

Superior rectus

2

Abducts the eye

Lateral rectus

3

Depression of the eye is the primary action. Also adducts and extorts.

Inferior rectus

4

Depression of the eye is the primary action. Also abducts and intorts.

Superior oblique

5

Elevation of the eye is the primary action. Also abducts and extorts.

Inferior oblique

6

Symmetrical or synchronous movement of the eyes

Conjugate movement

7

Movement of the eyes in opposite direction

Disconjugate movement

8

The six recognized eye movement control systems

Vestibulo-ocular reflex, Optokinetic, Saccadic, Smooth pursuit, Fixation & Vergence "VOSS FV"

9

Controls the degree of convergence or divergence of the eyes, maintaining macular fixation no matter what the distance to the target.

Vergence

10

Proper _______ of both eyes on the visual target permits fusion of both retinal images into one visual image.

Fixation

11

Pathways mediate fixation and fusion

Retino-occipito-tegmental (ROT) and reticulo-occipito-fronto-tegmental (ROFT) pathways

12

Produces conjugate eye movements of equal magnitude but in the opposite direction to compensate for head movements in order to maintain foveation during motion of the head. Also called eye counterrolling.

Vestibulo-ocular reflex

13

Occurs in a comatose patient who cannot fixate.

Doll's eye maneuver

14

A positive doll's means that the ____________ is intact.

Vestibuloproprioceptive counterrolling reflex

15

Ensures that the fovea maintains fixation on the object of interest.

Supranuclear control of eye movements

16

Cortical areas involved in the generation of saccades

Supplemental eye field, Posterior eye field(parietal lobe) & Frontal eye field "SPF"

17

Controls horizontal saccades to the opposite side

Frontal Eye field

18

A prominent fiber tract that unites the oculomotor, trochlear and the abducens nuclei. Runs in the midline in the _________ of the brainstem.

Medial Longitudinal Folds. Dorsal tegmentum.

19

In MLF: crosses the ____, soon after beginning its ascent to the contralateral ______________.

Pons. Third nerve complex.

20

In MLF: coordinate movements of the _____, as well as head and eye, and even body movements.

2 eyes

21

Enumerate oculomotor pathways

Frontopontine, Medial Longitudinal Fasciculus, Parapontine Folicular "FMP"

22

Vertical gaze. Upgaze and downgaze pathways course in the:

Pretectum, Rostral midbrain & Posterior commissure

23

In vertical gaze, voluntary vertical movements are the simultaneous activity of both the

Frontal cortical eye fields

24

Types of peripheral part

Infranuclear

25

Types of central part

Internuclear & Supranuclear

26

Involvements of peripheral disorder

Extraocular muscles, CN nuclei & CN fascicles "ECC"

27

CN IV: trochlear. Type of pathway

GSE: superior oblique

28

Contralateral MR does not receive a signal to contract. As a result, gaze to one side results in _______ of the eye ipsilateral to PPRF, with no _________ of contralateral eye.

Internuclear Opthalmoplegia

29

In Internuclear Opthalmoplegia, there may be nystagmus of the _________. Bilateral INO = ______(wall eyed bilateral INO) INO is labeled by the side with ________. Common in MS and brainstem strokes.

Abducting eye. WEBINO. Adduction failure.