PNB 2264 Lecture Notes - Lecture 20: Inner Ear, Eustachian Tube, Far-Sightedness
16 Aug 2018
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Document Summary
Bipolar cell, rhodopsin (pigment and protein) retinal a. Activation of g protein (tansducin) close na+ channels hyperpolarize stop light 11-cis-retinal all-trans-retinal opsin changes inhibitory transmitter release. Up or down rhodopsin in response to light. Pupil reflex rate at which rhodopsin is recycled in the absence of light in order of the process t continue. Pupil closes to limit light hitting retina. Greater acuity, fewer iodeosin pigment: red 560-565 nm, green 535-540 nm, blue 430-440 nm. Orange 99% red, 42% green and 0% blue. 120 million over rest and 6-7 million cones. Information to cns rod or cone bipolar (convergence for rods) ganglion cells exit as optic nerve. Horizontal rods and cones and bipolar cells. Ganglionic cells visual processing occurs at the ganglionic cells. Light rods and cones bipolar cells ganglionic cells m cells and p cells lateral geniculate nucleus m pathway: movement, p blob: color, p interblob: form and depth . Reminder rods b/w stimulus, high sensitivity and low acuity.
