Lecture 16 Eye movements

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534 Neuroanatomy Flashcards on Lecture 16 Eye movements, created by Mia Li on 03/12/2017.
Mia Li
Flashcards by Mia Li, updated more than 1 year ago
Mia Li
Created by Mia Li almost 7 years ago
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Question Answer
Which somatomotor neurons are responsible for eye movements? CN III (occulomotor) CN IV (trochlear) CN VI (abducens)
the 2 cerebral regions for eye movement control. frontal eye fields supplementary eye fields
Nuclei controlling/coordinating eye movements are 1. superior colliculi 2. vestibular nucleus
Which branch sends input to the vestibular nucleus? vestibular branch of CN VIII (vestibulocochlear)
Special movement features of the eyes 1. smooth pursuit 2. vergence 3. saccades 4. optokinetic nystagmus 5. vestibuloocular reflex
smooth pursuit is controlled by _______ parietal-temporal-occipital cortex (PTO)
saccades are controlled by Frontal eye fields
This muscle elevates the eye superior rectus
This muscle depresses the eye inferior rectus
This muscle adducts the eye medial rectus
This muscle abducts the eye lateral rectus
This muscle gives intorsion to the eye superior oblique
This muscle gives extorsion to the eye inferior oblique
CN III innervates 1. inferior, superior, medial recti 2. inferior oblique 3. levator palpebrae
CN IV innervates superior oblique (think: SO4)
CN VI innervates lateral rectus (abducens ABDUct!)
CN III arises from _____ nuclei oculomotor complex (oculomotor nucleus)
Midbrain transverse cut, if you can see superior colliculi, the nueclei ventral to cerebral aqueduct are oculomotor nuclei
The axons from oculomotor nuclei travels ventrally through the ________ and _______, exiting the midbrain between _________. Arteries surrounding its path: __________, ________. midbrain central --> ventral tegmentum --> exits between cerebral peduncles Vessels: posterior cerebral artery and superior cerebellar artery
Right dorsal to the oculomor nucleus, there are the _________, which are the origin for parasympathetic control of pupils. Edinger-Westphal
The trochlear nerve arise from _________ in the midbrain at the level of ________. They are ______ to the medial longitudinal fasciculus and are at the ______ of the periaqueductal gray. The trochlear nerve arises from [trochlera nucleus] in the midbrain at the level of [inferior colliculus]. They are [lateral] to the medial longitudinal fasciculus and are at the [ventraomedial border] of the periaqueductal gray.
The abducens nerve arises in the _______ nucleus in the _____. They are wrapped around by the genu of _______ and are at the posterior border of _______. abducens nucleus in the pons genu of facial nerve (CN VII) 4th vnericle
The frontal eye fields (BA ___) control the ______ movements. There is also a supplementary eye field (BA ___) which initiate voluntaryFEF: BA8 eye movement. FEF: BA8. Controls saccades. SEF: BA6.
When something is in your left visual field, the (left/right) FEF is activated by visual cortex to plan a saccade in the left. RIGHT
Outline the saccade pathway starting from 'object of interest in left visual field' 1. object of interest in left visual field 2. FEF of right hemisphere activated 3. axon exits R FEF and synapse in right superior colliculus 4. axon enter the medial longitudinal fasciculus (MLF) to descend and decussate 5. axon from R MLF synapse with L paramedial pontine reticular formation (PPRF) 'horizontal gaze center' 6a. L PPRF synpase with L abducens neurons 7a. L abducens neuron activates L lateral rectus 8a. L eye abducted 6b. L PPRF also synapse with abducens interneurons which decussates to travel to R MLF 7b. axon from R MLF synapse on medial rectus motor neurons in the righr oculomotor nucleus 8b. right eye adducts.
The eye movements are also coordinated by the _______ of basal ganglia which relays from _______,______and_____ to speficy the 'what and where' of what we see. The eye movements are also coordinated by the [caudate nucleus] of basal ganglia which relays from [parietal, temporal, aand occipital aasociation cortex] to specify the 'what and where' of what we see.
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