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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

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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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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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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.
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Related Experiment Video

Updated: Jul 4, 2025

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Neural extracellular matrix regulates visual sensory motor integration.

Jacqueline Reinhard1, Cornelius Mueller-Buehl1, Susanne Wiemann1

  • 1Department of Cell Morphology and Molecular Neurobiology, Faculty of Biology and Biotechnology, Ruhr University Bochum, 44780 Bochum, Germany.

Iscience
|February 6, 2024
PubMed
Summary

The absence of four extracellular matrix proteins severely impairs retinal function and visual motion processing in mice. This dysfunction is linked to the loss of specific retinal cells and imbalanced synaptic signaling.

Keywords:
NeuroscienceOmicsSensory neuroscienceTranscriptomics

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • Extracellular matrix proteins regulate synaptogenesis and synaptic plasticity.
  • Proper synaptic function is crucial for visual processing.

Purpose of the Study:

  • To investigate the role of four specific extracellular matrix proteins (brevican, neurocan, tenascin-C, and tenascin-R) in retinal function and visual processing.
  • To examine the impact of their combined absence on visual motion perception and retinal cell development.

Main Methods:

  • Utilized quadruple knockout mice lacking brevican, neurocan, tenascin-C, and tenascin-R.
  • Assessed retinal function and visual motion processing in vivo.
  • Analyzed the development of cholinergic direction-selective starburst amacrine cells and synaptic signaling balance.

Main Results:

  • Quadruple knockout mice exhibited severe retinal dysfunction and diminished visual motion processing.
  • A developmental loss of cholinergic starburst amacrine cells was observed.
  • An imbalance between inhibitory and excitatory synaptic signaling was noted in the knockout retina.

Conclusions:

  • The four studied extracellular matrix proteins are essential for normal retinal function and visual motion processing.
  • Their absence disrupts critical retinal cell populations and synaptic balance.
  • This highlights the functional importance of these ECM proteins in the visual system.