PSYB65H3 Lecture Notes - Lecture 5: Optic Chiasm, Posterior Cerebral Artery, Macula Of Retina
Document Summary
Everything begins in the retina part of the central nervous system => an outgrowth of the brain. Retina divided down the centre, each half sends its own information. => temporal portion closest to the outside of the head tract => pathway inside the central nervous system nerve => pathway outside the central nervous system: distinguishing bw inside and outside cns. Optic chiasm: crossover point for the two optic nerves. Optic nerve: moving away from the eye; optic tract: moving closer toward the brain. Temporal portion of retina come together at the optic chiasm and separate out toward the outside; continues onto the same side of the brain. Nasal portion fibres cross at optic chiasm and move to opposite sides of the brain. In order to go through the tiny opening of the iris, objects on the right side of the visual field will go through to the left side of each retina through the iris.
