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関連する概念動画

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.
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,...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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...
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...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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関連する実験動画

Updated: Jul 8, 2026

A Simple Behavioral Assay for Testing Visual Function in Xenopus laevis
08:34

A Simple Behavioral Assay for Testing Visual Function in Xenopus laevis

Published on: June 12, 2014

ニワトリの虹膜における非視覚的光受容

Daniel C Tu1, Matthew L Batten, Krzysztof Palczewski

  • 1Department of Ophthalmology and Visual Sciences, Washington University Medical School, St. Louis, MO 63110 USA.

Science (New York, N.Y.)
|October 2, 2004
PubMed
まとめ
この要約は機械生成です。

ニワトリの虹彩は,視覚的でない経路を用いて光に収束する. この研究は,オプシンではなく,クリプトクロームが,胚の雛の目におけるこの光反応を媒介することを明らかにし,脊椎動物の視力におけるクリプトクロームの保存された役割を示唆しています.

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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

関連する実験動画

Last Updated: Jul 8, 2026

A Simple Behavioral Assay for Testing Visual Function in Xenopus laevis
08:34

A Simple Behavioral Assay for Testing Visual Function in Xenopus laevis

Published on: June 12, 2014

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

科学分野:

  • オフタルモロジック (眼科)
  • 分子生物学は分子生物学である.
  • 発達生物学 発達生物学とは

背景:

  • 胚のニワトリの虹膜は,光による収縮を示す.
  • この反応の特徴は,典型的な視覚光伝導機構と矛盾しています.

研究 の 目的:

  • 胚鶏における光誘発性虹膜収縮の基礎となる光感受機構を調査する.
  • オプシンまたはオプシン以外の色素がこの反応を媒介するかどうかを判断する.

主な方法:

  • アイリス収縮のアクションスペクトル分析.
  • 飽和光曝露に対する瞳孔の反応の評価.
  • レチノイド減少と視覚光伝導阻害剤の効果.
  • クリプトクロームとメラノプシン遺伝子のノックダウンが光敏感性への影響.

主要な成果:

  • アイリスの光敏感性は,短波長光でピークに達し,暗号クロームの吸収スペクトルと一致しました.
  • 瞳孔の反応は,強烈な光にさらされた後,衰弱ではなく,増強を示した.
  • 光感受性は,レチノイドと視覚光伝導経路とは無関係でした.
  • クリプトクローム・ノックダウンは虹膜の光敏感性を著しく低下させ,メラノプシン・ノックダウンは効果がなかった.

結論:

  • 胚のニワトリの虹膜は,光による収縮のために,オプシン以外の光受容メカニズムを使用しています.
  • クリプトクロームは,この反応を媒介する主要な光受容体であるようです.
  • これは,従来の視力を超えた脊椎動物の眼光光感知における暗号染色体の役割が保存されていることを示唆している.