Extra-Ocular Muscles Flashcards
what are the 4 straight extra-ocular muscles
superior rectus
inferior rectus
medial rectus
lateral rectus
what are the other 3 (non-straight) extra-ocular muscles
superior oblique
inferior oblique
Levator palpebrae superiors
what direction does the superior rectus move the eye
moves the eye up and medially (up and in)
what direction does the intefior rectus move the eye
down and in (medial)
what direction does the lateral rectus move the eye
laterally
what direction does the medial rectus move the eye
medially
what muscle moves the eye from side to side in a down and medial rotation
superior oblique
what muscles moves the eye from side to side in an up and lateral rotation
inferior oblique
what muscles is responsible for eyelid movement
levator palpebrae superioris
what part of the eyelid provides a stable attachment for the levator palpebrae superiors
the Tarus - thick plate of connective tissue
what attaches the lavator palpebrae superiors to the eyelid
superior tarsal muscles - smooth muscle fibres
what innervates the superior tarsal muscles
sympathetic nervous system
what nerve innervates the lever palpebrae superiors
Oculomotor nerve (CNIII)
where do all the rectus muscles originate
the common tendinous ring
where do rectus muscles attach
the sclera
what nerve innervates the superior rectus
oculomotor
what nerve innervates the inferior rectus
oculomotor
what nerves innervated the lateral rectus
ABDUCENS (adducts the eye so is innervated by abducens)
what nerve innervates the medial rectus
oculomotor
where do the oblique muscles attach
the sclera
where does the superior oblique originate
the body of the sphenoid - then travels through a pulley
what is the pulley of the superior oblique called
the trochlear
what nerve innervated the superior oblique
trochlear nerve (CNIV)
Where does the inferior oblique originate
the medial side of the orbital floor
what nerve innervated the inferior oblique
oculomotor nerve
