Oculomotor Nerve [Important Notes] Flashcards
Two smooth muscles innervated by CN III?
sphincter/constrictor pupillae + ciliary body
Five skeletal muscles innervated by CN III?
levator palpebrae, inferior oblique and 3 rectus (superior, medial & inferior)
Three components of the near triad?
3 by CN III; convergence of eyes, pupillary constriction, contraction of ciliary muscle
Action of superior rectus muscle?
intorsion, adduction and elevation [turns pupil up and in]
Action of inferior rectus muscle?
extorsion, adduction and depression [turns pupil down and in]
Action of inferior oblique muscle?
extorsion, abduction and elevation [turns pupil up and out]
Muscle innervated by CN IV?
superior oblique
Action of muscle innervated by CN IV?
intorsion, abduction and depression [turns pupil down and out]
Action to test [isolate] muscle innervated by CN IV?
adduct and depress [in and then down]
Muscle innervated by CN VI?
lateral rectus
Action of lateral rectus muscle?
abducts eye
Action to test [isolate] the superior rectus muscle?
abduct + look up
Action to test [isolate] the inferior rectus muscle?
abduct + look down
Action to test [isolate] the inferior oblique muscle?
adduct + look up
What two extraocular muscles are used to look straight up?
superior rectus and inferior oblique
