EXTRAOCULAR MUSCLES

Extra-ocular muscles; extrinsic muscles of eyeball
- Voluntary Muscles
  - Orbitalis; orbital muscle
  - Superior rectus
  - Inferior rectus
  - Medial rectus
  - Lateral rectus
    - Check ligament of lateral rectus muscle
  - Common tendinous ring; common anular tendon
  - Superior oblique
    - Trochlea
    - Tendinous sheath of superior oblique
  - Inferior oblique
  - Levator palpebrae superioris
    - Superficial layer
    - Deep layer
Involuntary muscles
Movements of eyeball
- Around a transverse axis
  - upward rotation or elevation (33 degrees )
  - Downwards rotation or depression ( 33 degrees)
- Around a Vertical Axis
  - Medial rotation or adduction ( 50 degrees )
  - Lateral rotation or abduction ( 50 degrees )
- Around an anteroposterior axis
  - Intorsion
  - Extorsion
Single or pure movements
- upward rotation or elevation
  - superior rectus and inferior oblique
- Downward rotation or depression
  - Inferior rectus and superior oblique
- Medial rotation or adduction
  - Medial rectus , superior rectus and inferior rectus
- Lateral rotation or abduction
  - Lateral rectus , superior oblique and inferior oblique
- Intorsion
  - superior oblique and superior rectus
- Extorsion
  - inferior oblique and inferior rectus
Combined movements
- Coordinated movements
  - Conjugate ocular movements
    - Gaze