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Related Concept Videos

Vision01:24

Vision

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.
Visual System01:26

Visual System

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.
Once through the pupil, the light passes through the lens, a...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
The Retina01:32

The Retina

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.
Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...

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Updated: Jun 4, 2026

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Published on: August 11, 2016

Anatomy of the Visual Pathways.

Agni Kakouri1, J Matthew Debnam2, Bita Esmaeli3

  • 1Department of Ophthalmology, University of Texas McGovern School of Medicine, Houston, TX, USA.

Radiologic Clinics of North America
|June 2, 2026
PubMed
Summary
This summary is machine-generated.

The visual system transmits sight information from the eye's retina to the brain. Understanding the optic pathway and its disruptions aids in diagnosing various diseases affecting vision.

Keywords:
AnatomyOptic chiasmOptic nerveRetinaVisual pathways

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Last Updated: Jun 4, 2026

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual System Research

Background:

  • The optic pathway, also known as the visual system, is crucial for transmitting sensory information.
  • It extends from the retina within the globe to the visual cortex in the occipital lobe.
  • The globe, particularly the retina, functions as the primary visual organ, detecting light and converting it into neural signals.

Purpose of the Study:

  • To elucidate the function of the optic pathway in visual information processing.
  • To highlight the diagnostic significance of disruptions within the visual system.
  • To provide a foundational understanding of the pathway from the eye to the brain.

Main Methods:

  • Review of neuroanatomy and visual neuroscience principles.
  • Analysis of the signal transduction process from the retina.
  • Correlation of clinical signs with optic pathway integrity.

Main Results:

  • The optic pathway effectively conveys visual data from the retina to the brain.
  • The retina converts light stimuli into electrical and neural signals.
  • The optic nerve serves as the conduit for these signals to the visual cortex.

Conclusions:

  • Disruptions in the optic pathway can manifest as specific clinical signs.
  • These clinical signs offer valuable diagnostic clues for underlying neurological and ocular diseases.
  • The visual system's structure and function are integral to visual perception and disease diagnosis.