PSYB57H3 Study Guide - Optic Nerve, Visual Field, Aerial Perspective
Document Summary
fixations/saccades relieve/refresh retinal photorreceptors too prevent too much adaptation. eye movements are s[ecfcally designed for vision; most other moevements are not as specialized. eye movements: six muscles are attached to each eye and are arranged in three pairs: Eeye movement involve the rotation of the eye ball. 3: occulomotor nerve (originates in occulomotor nuceus in midbrain); ipsilaterally innervates almost all of the eye muscles except for two. 4: trochlear nerve (originates in trochlear nucleus) contralaterally innervates superior oblique muscles. 6: abducens nerve (originaltes in abducens nucleus) ipsilaterally innervates lateral rectus muscle; moves eye away from nose(temporally) Frontal eye fields & parietal cortex => Structure in midbrain that plays important role in initiating and guiding eye movements. When stimulated with electrical signals, eye movements can be observed. Eye movements are controlled by the cerebral cortex; we make conscious eye movements. Cenetrs for eye motor control: frontal eye field; parietal cortex(->superior colliculi); and basal ganglia.
