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EXTRAOCULAR MUSCLES
IMPORTANT LANDMARKS
CONTENTS OF ORBIT
 Eyeball
 Fascia bulbi
 Muscles
 Vessels
 Nerves
 Lacrimal gland
 Orbital fat
EXTRAOCULAR MUSCLES
Voluntary
muscles
Involuntary
muscles
Extraocular
muscles
LPS
Recti muscles
Oblique muscles
Superior tarsal muscle
Inferio...
• ANNULUS OF ZINN -
common tendinous ring
• Attachments
• Forms a muscle cone
RECTI MUSCLES - origin
Medial Rectus
Lateral Rectus
Superior Rectus
Inferior Rectus
RECTI MUSCLES - origin
RECTI MUSCLES - Insertion
 Inserted into sclera
 In front of equator
• Distance from cornea
MR = 5.5mm
IR = 6.5mm
LR = 6...
Superior Oblique
SUPERIOR OBLIQUE - origin
SUPERIOR OBLIQUE – Insertion
Behind the equator on sclera in posterosuperior
quadrant, between the superior and lateral re...
Inferior Oblique
INFERIOR OBLIQUE - origin
INFERIOR OBLIQUE – Insertion
Behind the equator on sclera in posterior quadrant,
between the superior and lateral rectus
Three cranial nerves
3. Trochlear nerve2. Abducent nerve1. Oculomotor nerve
Superior obliqueLateral rectus
1. Superior rec...
ACTION OF INDIVIDUAL MUSCLES
 Adduction-MR
 Abduction-LR
 In Abducted eye
Elevation-SR
Depression-IR
 In Adducted eye
...
MOVEMENTS-DUCTIONS
Elevation
Depression Abduction
Adduction Intorsion
Extorsion
• Elevation & Depression – Around the tran...
drepression
elevation
1.Primary position
MOVEMENTS-VERSIONS (CONJUGATE)
 Convergence (simultaneous movement nasally)
 Divergence (simultaneous temporal movement)
MOVEMENTS-VERGENCE
DUCTIONS - MUSCLES PRODUCING
• Elevation – Superior rectus & Inferior oblique
• Depression – Inferior rectus & Superior ob...
Levator palpebrae superioris
LEVATOR PALPEBRAE SUPERIORIS - Origin
 Undersurface of
lesser wing of
sphenoid
• Upper lamina : Skin of
upper eyelid
• Middle lamina: Superior
tarsus(Muller’s)
• Lower lamina: Superior
conjunctival for...
Nerve Supply :
 Voluntary part – Oculomotor Nerve
 Involuntary part – Sympathetics
Action :
Elevation of upper eye lid
L...
CINICAL TESTING
 Abnormal deviation of eyeball is known as
Squint (Strabismus)
 Damage to Abducent nerve - Medial
Squint
 Damage to Occ...
PTOSIS
Drooping of upper eyelid
• Complete ptosis
• Partial ptosis
Extraocular muscles
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Extraocular muscles

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Extraocular muscles

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Extraocular muscles

  1. 1. EXTRAOCULAR MUSCLES
  2. 2. IMPORTANT LANDMARKS
  3. 3. CONTENTS OF ORBIT  Eyeball  Fascia bulbi  Muscles  Vessels  Nerves  Lacrimal gland  Orbital fat
  4. 4. EXTRAOCULAR MUSCLES
  5. 5. Voluntary muscles Involuntary muscles Extraocular muscles LPS Recti muscles Oblique muscles Superior tarsal muscle Inferior tarsal muscle Orbitalis muscle
  6. 6. • ANNULUS OF ZINN - common tendinous ring • Attachments • Forms a muscle cone RECTI MUSCLES - origin
  7. 7. Medial Rectus Lateral Rectus Superior Rectus Inferior Rectus RECTI MUSCLES - origin
  8. 8. RECTI MUSCLES - Insertion  Inserted into sclera  In front of equator • Distance from cornea MR = 5.5mm IR = 6.5mm LR = 6.9mm SR = 7.7mm 5mm 6 mm 8 mm 7 mm
  9. 9. Superior Oblique SUPERIOR OBLIQUE - origin
  10. 10. SUPERIOR OBLIQUE – Insertion Behind the equator on sclera in posterosuperior quadrant, between the superior and lateral rectus
  11. 11. Inferior Oblique INFERIOR OBLIQUE - origin
  12. 12. INFERIOR OBLIQUE – Insertion Behind the equator on sclera in posterior quadrant, between the superior and lateral rectus
  13. 13. Three cranial nerves 3. Trochlear nerve2. Abducent nerve1. Oculomotor nerve Superior obliqueLateral rectus 1. Superior rectus 2. Medial rectus 3. Inferior rectos 4. Inferior oblique 5. Levator pelpebrae NERVE SUPPLY OF EOM
  14. 14. ACTION OF INDIVIDUAL MUSCLES  Adduction-MR  Abduction-LR  In Abducted eye Elevation-SR Depression-IR  In Adducted eye Elevation-IO Depression-SO
  15. 15. MOVEMENTS-DUCTIONS Elevation Depression Abduction Adduction Intorsion Extorsion • Elevation & Depression – Around the transverse axis • Adduction & Abduction – Around the vertical axis • Intortion & Extortion – Around the anteroposterior axis
  16. 16. drepression elevation 1.Primary position MOVEMENTS-VERSIONS (CONJUGATE)
  17. 17.  Convergence (simultaneous movement nasally)  Divergence (simultaneous temporal movement) MOVEMENTS-VERGENCE
  18. 18. DUCTIONS - MUSCLES PRODUCING • Elevation – Superior rectus & Inferior oblique • Depression – Inferior rectus & Superior oblique • Intortion – Superior rectus & Superior oblique • Extorsion – Inferior rectus & Inferior oblique • Adduction – Medial ,Superior & Inferior recti • Abduction – Lateral rectus, Superior & Inferior oblique RECTI -Adduct OBLIQUES – Abduct SUPERIORS – Intort INFERIORS -Extort
  19. 19. Levator palpebrae superioris LEVATOR PALPEBRAE SUPERIORIS - Origin  Undersurface of lesser wing of sphenoid
  20. 20. • Upper lamina : Skin of upper eyelid • Middle lamina: Superior tarsus(Muller’s) • Lower lamina: Superior conjunctival fornix LEVATOR PALPEBRAE SUPERIORIS - Insertion
  21. 21. Nerve Supply :  Voluntary part – Oculomotor Nerve  Involuntary part – Sympathetics Action : Elevation of upper eye lid LEVATOR PALPEBRAE SUPERIORIS
  22. 22. CINICAL TESTING
  23. 23.  Abnormal deviation of eyeball is known as Squint (Strabismus)  Damage to Abducent nerve - Medial Squint  Damage to Occulomotor nerve - Lateral Squint and Ptosis-Dropping of Eyelid  Damage to Trochlear nerve - diplopia while looking downwards Medial Squint Lateral Squint and Ptosis
  24. 24. PTOSIS Drooping of upper eyelid • Complete ptosis • Partial ptosis

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