Extraocular Musculature

Levator palpebrae superioris

  • Origin: inferior aspect of the lesser wing of sphenoid (adjacent to the common annular tendon) •Insertion:

1.medial and lateral walls of the orbit 2.superior tarsus

  • Action: elevates the eyelid •Blood: branches of ophthalmic artery •Nerve: oculomotornerve (III cranial)

 

Lateral rectus

  • Origin:

1.common annular tendon (which comes off the body and lesser wing of sphenoid) 2.margins of the optic canal

  • Insert: posterior to the sclerocornealjunction (each muscle inserting along its own directional axis) •Action: abducts eye •Blood: branches of ophthalmic artery •Nerve: abducensnerve (VI cranial)

 

Medial rectus

  • Origin:

1.common annular tendon (which comes off the body and lesser wing of sphenoid) 2.margins of the optic canal

  • Insert: posterior to the sclerocornealjunction (each muscle inserting along its own directional axis) •Action: adducts eye •Blood: branches of ophthalmic artery •Nerve: oculomotornerve (III cranial)

 

Superior rectus

  • Origin:

1.common annular tendon (which comes off the body and lesser wing of sphenoid) 2.margins of the optic canal

  • Insert: posterior to the sclerocornealjunction (each muscle inserting along its own directional axis) •Action:

1.elevates 2.medially rotates 3.adducts the eye

  • Blood: branches of ophthalmic artery •Nerve: oculomotornerve (III cranial)

 

Superior rectus

  • Origin:

1.common annular tendon (which comes off the body and lesser wing of sphenoid) 2.margins of the optic canal

  • Insert: posterior to the sclerocornealjunction (each muscle inserting along its own directional axis) •Action:

1.elevates 2.medially rotates 3.adducts the eye

  • Blood: branches of ophthalmic artery •Nerve: oculomotornerve (III cranial)

 

Inferior rectus

  • Origin:

1.common annular tendon (which comes off the body and lesser wing of sphenoid) 2.margins of the optic canal

  • Insert: posterior to the sclerocornealjunction (each muscle inserting along its own directional axis) •Action:

1.depress 2.laterally rotates 3.adducts the eyeПоділитися цим:

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Коментарі: 0Публікації: 8Реєстрація: 11-02-2021

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