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Related Concept Videos

Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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The Retina01:32

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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What is a Sensory System?01:31

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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[Structure and function of the visual pathway].

Judith Ungewiss1, Tobias Breuninger2, Ivan Milenkovic3

  • 1Fakultät für Optik und Mechatronik, Studiengang Augenoptik, Kompetenzzentrum "Vision Research", Hochschule Aalen, Anton-Huber-Str. 23, 73430, Aalen, Deutschland. Judith.Ungewiss@hs-aalen.de.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|March 11, 2020
PubMed
Summary
This summary is machine-generated.

The visual system processes environmental information through the retina, lateral geniculate nucleus, and primary visual cortex. This review details the anatomy and function of the human visual pathway.

Keywords:
NeuroanatomyNeurophysiologyReceptorsSignal processingVisual system

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neuroanatomy

Background:

  • The human visual system is the primary sensory pathway for environmental information.
  • Visual signals travel from retinal photoreceptors through bipolar and ganglion cells.
  • These signals are relayed to the lateral geniculate nucleus and then the primary visual cortex.

Purpose of the Study:

  • To explain the key anatomical and functional features of the visual system.
  • To provide a comprehensive overview of the visual pathway.

Main Methods:

  • A selective literature search was conducted across major scientific databases.
  • Databases included PubMed, Psychline, Google Scholar, Cochrane Library, and Web of Science.
  • Relevant books and websites in neuroanatomy, physiology, ophthalmology, and otology were also consulted.

Main Results:

  • The study synthesizes information on the visual system's structure and function.
  • Key components like photoreceptors, retinal cells, lateral geniculate nucleus, and visual cortex are detailed.
  • The pathway of visual information processing is elucidated.

Conclusions:

  • Understanding the visual pathway is crucial for comprehending visual perception.
  • This review consolidates essential knowledge on the visual system's neuroanatomy and physiology.
  • The findings support further research into visual cognition and spatial awareness.