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Name of muscle
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Types of fibre found
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Innervation
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Action
- Elevation - Moves eyeballs superiorly
- Depression - Moves eyeballs inferiorly
- Adduction - Moves eyeballs medially
- Abduction - Moves eyeballs laterally
- Extorsion - Rotates eyeballs laterally
- Intorsion - Rotates eyeballs medially
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MEDIAL RECTUS
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Fast twitch
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Lower division of the Oculomotor nerve (cranial nerve [CN] III)
- Adduction
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LATERAL RECTUS
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Fast twitch
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Abducens nerve (CN VI)
- Abduction
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SUPERIOR RECTUS
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Fast twitch
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Upper division of CN III
- Elevation, intorsion & adduction
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INFERIOR RECTUS
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Fast twitch
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Lower division of CN III
- Depression, extorsion & adduction
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SUPERIOR OBLIQUE
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Slow twitch
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Trochlear nerve (CN IV)
- Intorsion, depression & abduction
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INFERIOR OBLIQUE
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Slow twitch
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Lower division of CN III
- Extorsion, elevation & abduction
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Levator palpebrae superioris
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Slow twitch
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Oculomotor (III) nerve
- Elevates upper eyelids (opens eyes)
- Roof of orbit (lesser wing of sphenoid bone)
- The annulus of Zinn / Annular tendon / The Common tendinous ring (attached to orbit around optic foramen)
- Sphenoid bone, superior and medial to the tendinous ring in the orbit
- Maxilla in floor of orbit