11.8 Eye Motility and Orbit Flashcards
what are the two muscles that elevate the eye?
levator palpeberae superioris
superior tarsal muscle
the levator palpeberae superioris is innervated by: __________________
the superior tarsal muscle is innervated by: ___________________
cranial nerve 3
superior cervical ganglion
where are tears made?
they wash over the ________ and up in the _________ _________, which then leads into the _________ _______
lacrimal gland
cornea
lacrimal canaliculi
lacrimal sac
the lacrimal sac is drained by the _____________________, which runs into where?
the nasolacrimal duct
the inferior meatus of the nasal cavity
levator palpebrae superioris
innervation
independent action
CN 3
lifts eyelid
superior rectus
innervation
independent action
CN 3
up and in (since axis of bony orbit is at 23 degrees to the sagittal plane)
lateral rectus
innervation
independent action
CN 6
abducts eye (lateral movement)
medial rectus
innervation
independent action
CN 3
adducts eye (medial movement)
inferior rectus
innervation
independent action
CN 3
down and in (remember - axis of bony orbits at 23 degrees from the sagittal plane)
superior oblique
innervation
independent action
CN 4
depression and abduction
down and out
inferior oblique
innervation
independent action
CN 3
up and out
intorsion is rotation _______ the nose, what muscles does this use?
towards
superior oblique, superior rectus
extortion is rotation _________ the nose, what muscles does this work?
away from
inferior oblique, inferior rectus
what muscles do you use to look STRAIGHT up?
superior rectus
inferior oblique
what muscles do you use to look STRAIGHT down?
inferior rectus
superior oblique
