Extraocular muscles Flashcards
where do the rectus muscles originate
in the annulus of Zinn (a funnel shaped tendinous ring)
what is the oculomotor foramen
the area enclosed by the tendinous ring (annulus of Zinn)
what is the medial rectus muscle used for
convergence
what is the largest recti muscle
the medial rectus
which muscle is stronger, the medial or lateral rectus
the medial rectus
what innervates the medial rectus
inferior division of the oculomotor nerve
what innervates the lateral rectus
the abducens nerve
what innervates the superior rectus
superior division of the oculomotor nerve
what innervates the inferior rectus
the inferior division of the oculomotor nerve
fascial expansions from the sheath of the medial rectus give rise to what ligament
the medial check ligament
a fascial expansion from the inferior rectus and the inferior oblique contribute to what ligament
the suspensory ligament of lockwood
what muscle is the longest and thinnest
the superior oblique muscle
what innervates the superior oblique muscle
the trochlear nerve
what EOM does not originate from the annulus of Zinn
the inferior oblique originates from the front of the orbit (orbital plate of the maxilla)
where does the inferior oblique muscle have its tendinous insertion
posterior to the macula (shortest of all the muscles)
what innervates the inferior oblique muscle
inferior division of the oculomotor nerve
what is tenon’s capsule
thin membrane which envelops the eyeball from the optic nerve to the limbus, separating it from the orbital fat and forming a socket in which it moves.
what is the movement from primary gaze for the medial rectus
adduction
what is the movement from primary gaze for the lateral rectus
abduction
what is the movement from primary gaze for the superior rectus
elevation
what is the movement from primary gaze for the inferior rectus
depression
what is the movement from primary gaze for the superior oblique
intorsion
what is the movement from primary gaze for the inferior oblique
extorsion
