NSCI 324 Study Guide - Midterm Guide: Locus Coeruleus, Saccade, Critical Role
19 Mar 2017
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Document Summary
Pupillary control: optimizes pupil size for overall illumination: larger pupils in the dark and smaller pupils in bright light. Larger pupils dark: smaller pupils bright, to optimize visual sensitivity/acuity for overall luminance, major function of our pupil is to change according to luminensce, pupil constriction: innervated by the parasympathic nervous system. If one pupil constricts, the other will constrict too. Lack of consensual bilateral pupil constrictions with one light input indicates pathology. nucleus. Cg ciliary ganglion nucleus (parasympathetic component on cn iii nucleus: pupillary dilation: mediated by the sympathetic nervous system. Multiple sensations and arousal can produce pupil dilation. Sympathetic pathway from hypothalamus to spinal cord (c8-t2) to scg. Iris anatomy: outer radial muscle (radiating from the pupil): pupillary dilation targets the radial muscle and is mediated by sympathetic innervations. Inner circular muscle (concentric): pupillary constriction targets the circular muscle and is mediated by parapsympathetic innervations.
