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Flashcards in EOMs Deck (17):
1

Superior Oblique Muscle

#1 - internal rotation
#2 - depression (adducted position)
#3 - abduction (lateral rotation)

Innervated by fourth nerve/trochlear.

2

Inferior Oblique Muscle

#1 - external rotation
#2 - elevation
#3 - adduction

Innervated by the inferior branch of the oculomotor (III) nerve.

3

Medial Rectus Muscle

Innervated by the inferior division of the oculomotor (III) nerve.

4

Lateral Rectus Muscle

It is the only muscle supplied by the abducens nerve, cranial nerve VI.

5

Superior Rectus Muscle

#1 - elevation (primary)
#2 - intorsion
#3 - adduction

Innervated by the superior division of the oculomotor nerve.

6

Inferior Rectus Muscle

#1 - depresses
#2 - extorts
#3 - adducts

Innervated by the inferior division of oculomotor nerve (Cranial Nerve III).

7

Right ______ nerve palsy shows right hyperdeviation that worsens on left gaze, right head tilt, and downgaze, with relative excyclotropia of the right eye.

FOURTH

superior oblique muscle

8

Brown's Syndrome

Tendon sheath problem.

- limited elevation (especially during adduction)

9

Duane Syndrome Type I

Limited ABDUCTION with possible compensatory head turn towards affected side. Most common!

eg. DT1 OS, head turn toward left

10

Duane Syndrome Type II

Limited ADDUCTION with possible compensatory head turn towards unaffected side.

11

Duane Syndrome Type III

Limited ADDUCTION and ABDUCTION. Usually presents with head turn towards the affected side.

12

CN most likely to be affected by trauma?

CN 4 - trochlear

Only one to exit the dorsal aspect of the brainstem and is the ocular motor nerve with the longest course. Most susceptible to trauma.

13

Common causes of CN 4 palsy?

Congenital and trauma

14

Most common CN palsy?

CN 6

15

Causes of CN 6 Palsy

- tumours
- increased intracranial pressure
- Horner's syndrome
- trauma

System causes should resolve in 3 months, if not imaging should be done.

16

Indications for immediate imaging

- palsy found in a child
- multiple cranial nerve palsies
- cranial nerve palsy with othe rneurologic symptoms (headache)
- incomplete CN3 palsy
- pupil involving CN 3 palsy

17

Differentials for CN 6 Palsy

- esotropia
- Duane's Type I
- Medial wall orbital blowout fracture
- Ocular myasthenia
- Thyroid eye disease