While the reference text primarily focuses on the muscles responsible for eye movement (gaze), and doesn't explicitly address eye opening, the levator palpebrae superioris muscle is involved in lifting the upper eyelid, and therefore opening the eye. The other six muscles mentioned (four recti and two oblique muscles) facilitate eye movement and are not directly responsible for opening the eye.
Therefore, the muscle that directly helps in eye opening is:
- Levator palpebrae superioris
The six muscles primarily responsible for eye movement are:
- Four Recti Muscles: These include the superior rectus, inferior rectus, medial rectus, and lateral rectus.
- Two Oblique Muscles: These include the superior oblique and inferior oblique.
While important for gaze, these six muscles are not the primary drivers of eyelid elevation.
