Flashcards
Lecture 16 Eye movements
Cards in this deck (26)
- 1Which somatomotor neurons are responsible for eye movements?CN III (occulomotor)
CN IV (trochlear)
CN VI (abducens) - 2the 2 cerebral regions for eye movement control.frontal eye fields
supplementary eye fields - 3Nuclei controlling/coordinating eye movements are1. superior colliculi
2. vestibular nucleus - 4Which branch sends input to the vestibular nucleus?vestibular branch of CN VIII (vestibulocochlear)
- 5Special movement features of the eyes1. smooth pursuit
2. vergence
3. saccades
4. optokinetic nystagmus
5. vestibuloocular reflex - 6smooth pursuit is controlled by _______parietal-temporal-occipital cortex (PTO)
- 7saccades are controlled byFrontal eye fields
- 8This muscle elevates the eyesuperior rectus
- 9This muscle depresses the eyeinferior rectus
- 10This muscle adducts the eyemedial rectus
- 11This muscle abducts the eyelateral rectus
- 12This muscle gives intorsion to the eyesuperior oblique
- 13This muscle gives extorsion to the eyeinferior oblique
- 14CN III innervates1. inferior, superior, medial recti
2. inferior oblique
3. levator palpebrae - 15CN IV innervatessuperior oblique (think: SO4)
- 16CN VI innervateslateral rectus (abducens ABDUct!)
- 17CN III arises from _____ nucleioculomotor complex (oculomotor nucleus)
- 18Midbrain transverse cut, if you can see superior colliculi, the nueclei ventral to cerebral aqueduct areoculomotor nuclei
- 19The 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 - 20Right dorsal to the oculomor nucleus, there are the _________, which are the origin for parasympathetic control of pupils.Edinger-Westphal
- 21The 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.
- 22The 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 - 23The 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. - 24When something is in your left visual field, the (left/right) FEF is activated by visual cortex to plan a saccade in the left.RIGHT
- 25Outline 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. - 26The 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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- 534 Neuroanatomy Flashcards on Lecture 16 Eye movements, created by Mia Li on 03/12/2017.
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