Eye movement (sensory)

Eye Movement (Sensory)

Eye movement (sensory)

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Description:
Eye movement is the voluntary or involuntary movement of the eye, helping in acquiring, fixating and tracking visual stimuli. It may also compensate for a body movement, such as when moving the head. In addition, rapid eye movement occurs during REM sleep.

Introduction

Eyes are the visual organs that have the retina, a specialized type of brain tissue containing photoreceptors. These specialised cells convert light into electrochemical signals through the ganglion cell layer and travel along the optic nerve fibers to the brain.

Primates and many other invertebrates use two types of voluntary eye movement to track objects of interest: smooth pursuit and saccades.Krauzlis, RJ. The Neuroscientist. 2005 Apr;11(2):124-37. PMID 15746381. These movements appear to be initiated by a small cortical region in the brain's frontal lobe.Heinen SJ, Liu M. "Single-neuron activity in the dorsomedial frontal cortex during smooth-pursuit eye movements to predictable target motion." Vis Neurosci. 1997 Sep-Oct;14(5):853-65. PMID 9364724 This is corroborated by removal of the frontal lobe. In this case, the reflexes (such as reflex shifting the eyes to a moving light) are intact, though the voluntary control is obliterated.<ref...
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