Extraocular Muscles and its course in the eye
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This document discusses the extraocular muscles and fasciae surrounding the eyeball. It describes the orbital fascia, bulbar fascia, Tenon's capsule and its expansions. The recti muscles insert into the sclera slightly posterior to the limbus. The levator palpebrae superioris originates from the sphenoid bone and splits into superior and inferior lamellae that insert into the upper eyelid and conjunctiva. Individual extraocular muscle actions are also summarized, with the superior and inferior recti and oblique muscles producing elevation and depression, respectively.
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Extraocular Muscles and its course in the eye
- 5. FASCIA’S OF EYEBALL Orbital fascia or periorbita Fascial sheath of eyeball or Bulbar fascia TENON’S CAPSULE – extends from optic nerve to sclerocorneal juncton . Expansions of tenson’s capsule – a)Tubular sheath B)Medial check ligament C)Lateral check ligament
- 6. Lower part of tenon’s thickened to form SUSPENSORY LIGAMENT OF LOCKWOOD This prevents downward displacement of eyeball.
- 12. INSERTION The Recti are inserted into the sclera ,a little posterior to limbus [corneoscleral junction ]. The average distances of insertion from the cornea are : Superior – 7.7mm Inferior – 6.5 mm Medial – 5.5mm Lateral – 6.9mm
- 17. INSERTION Inserted on the inferolateral aspect eyeball behind the equator.
- 18. LEVATOR PALPEBRAE SUPERIORIS ORIGIN : Arise from orbital surface of lesser wing of sphenoid bone , anterosuperior to optic canal and to the origin of superior rectus . INSERTION : Levator splits into 2 parts : superior lamellae [voluntary ] Inferior lamellae [ involutary ]
- 19. Superior inserted into superior tarsus and skin of upper eyelid . Inferior lamella [Muller muscle ] into superior tarsus and into superior conjunctival fornix .
- 21. NERVE SUPPLY Levator palpebrae superioris is supplied by occulomotor nerve Inferior lamella [MULLER MUSCLE ] which is a smooth muscle is innervated by superior cervical sympathetic ganglion
- 31. ACTIONS OF INDIVIDUAL MUSCLES
- 33. SINGLE OR PURE MOVEMENTS It is produced by combined action of muscles . Similar actions get added together while opposing actions cancel each other. ELEVATION – Superior rectus and inferior oblique DEPRESSION – Inferior rectus and superior oblique
- 34. CONT’D INTORSION – Superior oblique and superior rectus EXTORSION – Inferior oblique and inferior rectus Mnemonic : SUPERIORS ARE INTORTORS INFERIORS ARE EXTORTORS
- 35. CONT’D ADDUCTION – Medial rectus, superior rectus and inferior rectus ABDUCTION – Lateral rectus, superior oblique and inferior oblique . MNEMONIC : RECTI ARE ADDUCTORS OBLIQUES ARE ABDUCTORS
- 41. CONJUGATE GAZE :
- 43. THANK YOU
- 44. THANK YOU ….