Extrinsic muscle that moves the eye upward is:

The extrinsic muscle that moves the eye upward is the Superior Rectus muscle.

Here are the steps to understand this:

1. The eye has six extrinsic muscles. These muscles are responsible for the movement of the eye.

2. The six muscles are: the Superior Rectus, Inferior Rectus, Lateral Rectus, Medial Rectus, Superior Oblique, and Inferior Oblique.

3. Each muscle has a specific role in eye movement. For example, the Lateral Rectus moves the eye outward, away from the nose. The Medial Rectus moves the eye inward, towards the nose.

4. The Superior Rectus muscle is responsible for moving the eye upward. This muscle is innervated by the oculomotor nerve (cranial nerve III).

5. Therefore, the extrinsic muscle that moves the eye upward is the Superior Rectus muscle.