4 - Eye Movements Flashcards
(63 cards)
lateral wall is _ degrees from sagittal plane, and axis of orbit is _ degrees laterally from axis of globe
45, 23
secondary movement of superior rectus:
intorsion
secondary movement of inferior rectus:
extorsion
to isolate movement of superior and inferior rectus, eye must be 23 degrees _
abducted
secondary movement of inferior oblique:
elevation
when eye is adducted, SO _
depresses eye
when eye is abducted, SO _
intorts eye
_ portion of CN III innervate 4/6 EOMs and levator
somatic efferent
_ portion of CN III innervates parasympathetic pupil and ciliary body
visceral efferent
oculomotor nuclear complex lies in _
tegmentum of midbrain
LMNs leave oculomotor nuclear complex and enter orbit via:
superior division to _ _
inferior division to _ _ _ _
SR, levator
IR, IO, MR, parasympathetic fibers
trochlear nerve is longest and most susceptible to damage
somatic efferent to innervates _
nucleus is found in midbrain at level of _
superior oblique
inferior colliculus
two components of abducens nerve:
somatic efferent: innervates _
interneurons: _
LR
relay center for coordination of eye movements, medial longitudinal fasciculus
abducens nucleus in pons leaves and courses over _
petrous ridge of temporal bone
SR is controlled _ by CN III
contralaterally
SO is controlled _ by CN VI
contralaterally
MR is controlled _ by III, and _ by interneurons of IV
ipsilaterally, contralaterally
MLF interconnects which 4 neurons?
3 4 6 8
MLF originates from _
vestibular nuclei of CN VIII
MLF
descending component: _
ascending component: _
vestibulospinal tract
coordination of eye movements
MLF mediates eye movements in response to vestibular stimuli, aka _
Vestibular-Optic Reflex (VOR)
MLF is heavily _
myelinated
horizontal gaze center is _
paramedian pontine reticular formation (PPRF)
vertical gaze center is _
midbrain, reticular formation, and pretectal area
