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Extraocular muscles
- 1. OCULAR MOTILITY AND EXTRA- OCULAR MUSCLES By Lambert MURWANASHYAKA Doc I,MS,UR-GAKO
- 2. Extra-ocular muscles 7 muscles Divided into 2 groups according to their functions The one move the eyelid The one which move the eyeball
- 3. 7 muscles Levator palpeblae superioris 4 recti muscles( straight muscles) 2 oblique muscles All these muscles work together to move superior eyelid and eyeball
- 4. Extra-ocular muscles Levator palpebrae superioris Origin: lesser wing of sphenoid bone Insertion: broadens into 2 wide aponeurosis. Superficial: to the skin of the superior eyelid Deeper: superior tarsus Innervation: CNIII and sympathetic Action: elevate the superior eyelid.
- 5. Axes of the eyeball Tridimensional movement Vertical axis Transverse axis Anteroposterial axis
- 6. Axes of the eyeball Transverse axis Elevation and depression
- 7. Axes of the eyeball Transverse axis Elevation and depression
- 8. Axes of the eyeball Transverse axis Elevation and depression
- 9. Axes of the eyeball Vertical axis Adduction and abduction
- 10. Axes of the eyeball Vertical axis Adduction and abduction
- 11. Axes of the eyeball Vertical axis Adduction and abduction
- 12. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 13. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 14. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 15. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 16. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 17. Axes of the eyeball Anteroposterial axis Intorsion and extorsion
- 18. Extra-ocular muscles Recti muscles 4 muscles Origin: common tendinous ring Insertion: sclera just posterior to the limbus Innervation: CNIII and IV Actions: primary actions are elevation depression adduction and abduction. secondary actions are adduction, medial and lateral rotations.
- 19. Extra-ocular muscles Oblique muscles 2 muscles Origin: SO: body of sphenoid bone IO: anterior part of the floor of orbit Insertion: sclera just deeper to superior and inferior recti. Innervation: SO: CN IV IO: CN III Actions: primary actions are medial and lateral rotation Secondary actions are depression and elevation
- 21. Ocular movement Superior and inferior recti muscles Primary actions : SR elevate the pupil IR depress the pupil Secondary actions depends on attachment of the muscles and orbital and optical axes alignment
- 22. Optical axis vs orbital axis
- 23. Ocular movements SR and IR approach the eye from posterior medial side of the eye ball and attach on sclera medially to vertical axis This result in adduction when they contact
- 24. Ocular movements Again the superior and inferior rectus attaches on the sclera lateral to the AP axis. This result in SR : medial rotation IR: lateral rotation
- 25. Ocular movements Superior and inferior oblique muscles SO and IO approach the eye from anterior medial side of the eyeball and attaches on sclera lateral to the AP axis. This result in SO: medial rotation IO: lateral rotation
- 26. Ocular movements Again SO and IO attaches on the sclera posterior to the transverse axis. This leads to SO: depression IO: elevation
- 27. Yoke muscles To direct the gaze, the coordination of both eyes must be accomplished by paired action of the contralateral yoke muscles. Example: to direct gaze to the right: the right LR and left MR act as yoke muscles.
- 28. Synergism and antagonism of EOM Only Medial and lateral recti which are able to move eye as single muscle in primary position. No single muscle can elevate the eye in primary position. 2 elevators : SR and IO act together to elevate eye: synergism But also the antagonize as rotators: antagonism, and this prevent rotation during elevation of the eye.
- 29. REFERANCES Moore's Clinically Oriented Anatomy 7E r-jogi-basic-ophthalmology-4th-edition Extra-ocular muscles tutorial from anatomy zone videos Teach me anatomy app.
- 30. THANKS !!