NSCI 201 Lecture Notes - Lecture 9: Retinal Ganglion Cell, Optic Chiasm, Ciliary Ganglion

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Midterm 1 is next week, on february 13th. Visual stimuli leave the eye via the optic nerve. In animals with eyes on either side of the head, vision is monocular and nearly all information crosses at the chiasma. In animals like primates, vision is very binocular because our eyes face forwards, and so less information crosses at the chiasma. In humans, only 60% of fibers cross sides. Passes from lateral geniculate nucleus of the thalamus (lgn) to primary visual. There is conscious and subconscious vision: conscious vision: cortex (aka striate cortex or v1) What you"re aware of seeing: subconscious. Dependent on the function of the melanopsin-expressing ganglion cell (third photoreceptor, intrinsically photoreceptive): Retinal ganglion superior colliculus: lose these cells, loses the circadian rhythm, superior colliculus: in charge of eye movement, putting together the senses. Bilateral reflex in response to light levels: both pupils should constrict at the same time.

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