Diplopia Impaired Ocular Movement

LEFT ORBIT

Optic foramen

nerve

, Trochlear nerve

Superior division of oculomotor nerve

- Inferior division of oculomotor nerve

Abducens nerve

Diplopia or double vision results from impaired ocular movement. RELATED ANATOMY AND PHYSIOLOGY

Six muscles control eye movement:

1. Superior rectus

2. Medial rectus

3. Inferior rectus

4. Inferior oblique

5. Superior oblique - IV - trochlear nerve

6. Lateral rectus - VI - abducens nerve

III - oculomotor nerve

The line of action of individual ocular muscles

Eye movements result from a continuous interplay of all the ocular muscles, but each muscle has a direction of maximal efficiency. The oblique muscles move the eye up and down when it is turned in. The superior and inferior recti move the eye up and down when it is turned out.

Looking up and out Looking up and in superior rectus v / inferior oblique

Lateral . ^ríTVv .. ■ Medial movement lateral — CW> medial movement

(abduction) rectus J rectus (adduction)

Looking down and out Looking down and in inferior rectus superior oblique

Eye movements are examined in the six different directions of gaze representing individual muscle action.

nerve

The III, IV and VI cranial nerves enter the orbit through the superior orbital fissure.

Optic foramen

LEFT ORBIT

, Trochlear nerve

Superior division of oculomotor nerve

- Inferior division of oculomotor nerve

Optic foramen Optic nerve - -

Supraorbital fissure------

Abducens nerve

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