What eye muscle control the movement of eye?

There are six extraocular muscles that control eye movement. These muscles are innervated by the cranial nerves (CNs). The muscle movement of the eye is coordinated and works together to control the movement of the eye in different directions.

1. Superior rectus (SR)

- Innervation: CN III (oculomotor nerve)

- Action: Elevates the eye and slightly adducts (moves the eye inward)

2. Inferior rectus (IR)

- Innervation: CN III

- Action: Depresses the eye and slightly adducts it

3. Medial rectus (MR)

- Innervation: CN III

- Action: Adducts the eye

4. Lateral rectus (LR)

- Innervation: CN VI (abducens nerve)

- Action: Abducts the eye (moves the eye outward)

5. Superior oblique (SO)

- Innervation: CN IV (trochlear nerve)

- Action: Depresses and slightly externally rotates the eye (moves the eye down and out)

6. Inferior oblique (IO)

- Innervation: CN III

- Action: Elevates and slightly externally rotates the eye (moves the eye up and out)

The coordinated contraction of these muscles allows the eyes to move smoothly in different directions and focus on objects at varying distances.