NEUR 3200 Lecture Notes - Lecture 15: Retina, Circadian Rhythm, Temporal Lobe
8 Mar 2016
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Document Summary
60% of axons from rgc from the optic nerve cross midline at optic chiasm. Rgc axons form 2 distinct pathways in the brain. Contains all axons from p cells plus some from m cells. Rgcs supply several structures in diencephalon and midbrain. Dorsal lateral geniculate nucleus of thalamus is a major target. Lgn then projects to cortex via the internal capsule. The optic radiation forms part of internal capsule and sends axons to the primary visual cortex. Contains axons from the remaining m cells (no p cells) Rgc supply the pretectum located between thalamus and superior colliculus-pretectum projects to edinger westphal nucleus. Edinger westphal nucleus projects to ciliary ganglia which supplies constrictor muscle of the iris: tectopulvinar system. Enables synchronization of night-day cycle with intrinsic circadian rhythms. Coordinates head and eye movements toward specific targets in the environment. Visual field of each retina are partially overlapping.
