01:830:331 Lecture Notes - Lecture 24: Postcentral Gyrus, Cerebral Cortex, Membrane Potential
24 Jul 2016
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Document Summary
~a stimulus alters membrane potential of the receptor. ~sensory transduction sensory events are transduced (converted) into receptor potentials. ~intensity is the amount of receptors that are activated. ~receptors usually don"t have axons, the membrane synapses with dendrites of other neurons. ~all receptors project to primary sensory cortex, passing through thalamic relay. ~20% of cerebral cortex is involved in analyzing visual information. ~visible light is from 380 to 760 nm. ~image needs to be focused on retina, causes neurons on the retina to fire, message is sent through optic nerve to the rest of the brain. ~remember retina is actually part of the brain. ~eyes are held in place in the orbits of the skull by 6 extraocular muscles for each eye. ~the extraocular muscles are attached to the sclera (white outer coating of eye) ~you can"t roll your eye all the way backwards because conjunctiva holds it in place, attaches to eyelid.
