Occular Muscles/conditions

Question 0

Lateral Rectus

Answer 0

1: abduction
2: /
3: /

Question 1

Medial Rectus

Answer 1

CN III

1: Adduction
2: /
3: /

Question 2

Superior Rectus

Answer 2

1: elevate
2: intorsion
3: adduction

Question 3

Inferior Rectus

Answer 3

1: depression
2: extorsion
3: adduction

Question 4

Superior oblique

Answer 4

1: intorsion
2: depression
3: abduction

Question 5

Inferior oblique

Answer 5

1: extorsion
2: elevation
3: abduction

Question 6

Exotropia
Hypotropia
Ptosis
Mydriasis

Answer 6

CN III palsy
- deviations from loss of innervations
- Ptosis/mydriasis from loss of parasympathetics
~ parasympathetic innervation to superior tarsal m.

Question 7

Hypertropia + head tilt

Answer 7

CN IV palsy

- head tilt compensates for double vision

Question 8

Esotropia

Answer 8

CN VI palsy (loss of innervation to lateral Rectus

Question 9

Carotid cavernous fistula

Answer 9

Cranial nerves III, IV and VI

• no movement of eye, dilated pupil
• generally trauma

Question 10

Identifying strabismus

Answer 10

Look for the light reflection

Question 11

Afferent pupillary defect

Answer 11

• ipsilateral stimulus: no constriction in either pupil

- contralateral stimulus: : Normal constriction in both pupils

Question 12

Efferent pupillary defect

Answer 12

• Ipsilateral stimulation: unresponsive ipsilateral pupil, contralateral pupillary constriction
• Contralateral stimulation: unresponsive contralateral (effected) pupil, Normal contraction in stimulated people

Question 13

Childhood strabismus

Answer 13

• Esotropia selective and transient

- result of hyperaccomodation, glasses fix the problem

Question 14

Marcus Gunn pupil

Answer 14

RAPD

- paradoxical dilation of ipsilateral affected eye upon 2-3 alt stimulation

Question 15

Corneal reflex

Answer 15

CN V - afferent

CN VII - efferent

Question 16

Post chiasm vs. occipital lesion

Answer 16

Essentially the same: homonymous hemianopsia

• difference is macular sparing in occiput
• distal Myers loop hemianopsia