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Related Concept Videos

Vision01:24

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

Photoreceptors and Visual Pathways

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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Updated: Apr 24, 2026

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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The visual pathway--functional anatomy and pathology.

David James Swienton1, Adam G Thomas2

  • 1Imaging Department, Leicester Royal Infirmary, Leicester, UK.

Seminars in Ultrasound, CT, and MR
|September 14, 2014
PubMed
Summary
This summary is machine-generated.

Neuroimaging helps diagnose visual failure by locating issues in the visual pathway. Lesion location, from the optic nerve to the brain, predicts the type of visual deficit observed.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Radiology

Background:

  • Visual failure is a frequent clinical symptom prompting neuroimaging.
  • Understanding the visual pathway is crucial for diagnosing visual deficits.
  • Different parts of the visual pathway correspond to specific visual field defects.

Purpose of the Study:

  • To correlate patterns of visual failure with specific anatomical locations within the visual pathway.
  • To guide neuroimaging strategies based on clinical presentation of visual deficits.
  • To highlight advanced imaging techniques for visualizing visual pathways.

Main Methods:

  • Review of clinical presentations of visual failure.
  • Correlation of visual field defects (monocular, bitemporal, homonymous hemianopia, quadrantanopia) with anatomical locations (prechiasmatic, chiasmatic, retrochiasmatic, optic radiations).
  • Discussion of neuroimaging modalities, including diffusion tensor imaging for pathway visualization.

Main Results:

  • Monocular deficits point to anterior (prechiasmatic) pathway involvement.
  • Bitemporal hemianopia suggests chiasmatic lesions.
  • Retrochiasmatic lesions typically cause homonymous hemianopic defects.
  • Quadrantanopias are often associated with optic radiation lesions.
  • Parietal and temporal lobe lesions cause 'where' and 'what' visual perception issues, respectively.

Conclusions:

  • Clinical visual deficits provide a roadmap for localizing lesions within the visual system.
  • Neuroimaging is essential for confirming diagnoses and understanding the extent of visual pathway damage.
  • Diffusion tensor imaging offers valuable insights into the integrity of visual and visual association pathways.