Extraoccular, Circumorbital musclesmuscles Flashcards
Origin of Inferior Rectus
Common tendinous ring at the apex of the orbit
Insertion of Inferior Rectus
Sclera on the inferior surface of the eyeball
Action of Inferior Rectus
Depresses and adducts the corneal part of the eyeball: Rotates the superior pole of the iris laterally
Origin of Medial Rectus
Common tendinous ring at the apex of the orbit
Insertion of Medial Rectus
Sclera on the medial surface of the eyeball
Action of Medial Rectus
Adducts the corneal part of the eyeball
Origin of Lateral Rectus
Common tendinous ring at the apex of the orbit
Insertion of Lateral Rectus
Sclera on the lateral surface of the eyeball
Action of Lateral Rectus
Abducts the corneal part of the eyeball
Origin of the Superior Rectus
Common tendinous ring at the apex of the orbit
Insertion of Superior Rectus
Sclera on the superior surface of the eyeball
Action of Superior Rectus
Elevates and adducts the eyeball; rotates the superior pole of the iris medially
Origin of Superior Oblique
Apex of the orbit above the optic canal
Insertion of Superior Oblique
Sclera on the posterior superior surface of the eyeball
Action of Superior Oblique
Depresses and abducts the eyeball, rotates the superior pole of the iris medially
Origin of Inferior Oblique
Floor of the orbit lateral to the lacrimal groove
Insertion of Inferior Oblique
Sclera on the inferior surface of the eyeball
Action of Inferior Oblique
Elevates and abduct the corneal part of the eye
Rotates the superior pole of the iris laterally
When eye is abducted, it elevates the cornea
Origin of Levator Palpebrae Superioris
Apex of the orbit above the optic canal
Insertion of Levator Palpebrae Superioris
Skin and fascia of upper eyelid and the superior tarsal plate
Action of Levator Palpebrae Superioris
Elevates the upper eyelid
Origin of Corrugator
Medial part of the superciliary arch
Insertion of Corrugator
Skin of the medial half of the eyebrow
Action of Corrugator
Pulls the eyebrow together medially
