EOMs Flashcards
What type of eye movements have to do with the Z axis?
Adduction and abduction.
What type of eye movements have to do with the X axis?
Elevation and depression.
What type of eye movements have to do with the Y axis?
Intorsion and extorsion.
Where do the rectus muscles originate?
The common tendinous ring (Annulus of Zinn)
What is another name for the Annulus of Zinn?
Common tendinous ring.
Where do the rectus muscles insert?
on the Spiral of Tillaux.
What is meant by the term “Spiral” of Tillaux?
Beginning with the medial rectus muscle and moving around clockwise (as looking at the eye), the distance between the muscle insertion and limbus progressively grows larger
Where does the medial rectus muscle originate?
The common tendinous ring and the optic nerve sheath.
Where does the medial rectus muscle insert?
Anterior globe.
What is the action of the medial rectus muscle?
Adduction.
Where does the lateral rectus muscle originate?
The common tendinous ring and the greater wing of the sphenoid.
Where does the lateral rectus muscle insert?
Anterior globe.
What is the action of the lateral rectus muscle?
Abduction.
What nerve innvervates the lateral rectus muscle?
The abducens nerve (CN VI).
Where does the superior rectus muscle originate?
Common tendinous ring and optic nerve sheath.
Where does the superior rectus muscle insert?
Superior, anterior globe.
What nerve innvervates the medial rectus muscle?
Inferior division of oculomotor nerve (CN III).
What is the action of the superior rectus muscle?
Primary action is elevation. Secondary actions are adduction and intorsion.
Where does the inferior rectus muscle originate?
Common tendinous ring
