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What two nuclei are associated with CN III? oculomotor and edinger-westphal nucleus
What nucleus is associated with CN IV? trochlear nuclus
What nucleus is associated with CN VI? abducens nucleus
What is the pretectal area? deep in the midbrain. Involved in the reflex for the pupil ot contrict
What is edinger westfall nucleus? Preganglionic parasympathetics
What are the two pathways of CN III? control size of pupil and one for lens accommodation and convergence
Where do nerves travel after the 2nd order neurons synaps in the pretectal area? bilaterally to the edinger-westphal nucleus which projects to the ciliary ganglion which then project to the papillae muscle
Why do both pupils constrict when you shine a light in one eye? because both left and right pretectal areas project bilaterally to initiate the reflex to both eyes
How does lens accommodation work? Neurons in the visual cortex will project axons to the pretectal area and then the pretecgtal area projects axons to the oculomotor and edingerwestphal nucleus
How does the edinger-westphal nucleus work with lens accommodation? Projects to the ciliary ganglion which causes contraction of the ciliary muscles to adjust tension on the lens
How does the oculomotor nucleus work for lens accommodation? contraction of medial recti muscles causing convergence
How does horizontal eye movement work? The abducens nuclei will project 2 paths…one to the contralateral side which will go thru the ocularmotor nuclei that will inhibit medial movement and one straight to the lateral rectus so that the eyes move together. The same is for the opposite side.
What is the medial longitudinal fasciulus? it is the tunnel that connects the abducens with the oculomotor nuclei
What is theparapontine reticular nucleus coordinates horizontal eye movements
Created by: tjamrose