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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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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 layer, the vascular tunic,...
Muscles of the Eye01:20

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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
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Evolutionary Psychology01:20

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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Association Areas of the Cortex01:21

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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:
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Vision01:24

Vision

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Visualizing Ocular Morphogenesis by Lightsheet Microscopy Using rx3:GFP Transgenic Zebrafish
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Eye evolution and its functional basis.

Dan-E Nilsson1

  • 1Department of Biology, Lund Vision Group, Lund University, Lund, Sweden. dan-e.nilsson@biol.lu.se

Visual Neuroscience
|April 13, 2013
PubMed
Summary
This summary is machine-generated.

Eye evolution progressed from simple light detection to complex vision, driven by increasing behavioral demands. This functional analysis reveals key innovations and independent evolutionary paths for photoreception across animal groups.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Comparative genomics

Background:

  • Visually guided behavior drives eye evolution, increasing demands on photoreceptor organs.
  • A proposed evolutionary sequence includes nondirectional photoreception, directional photoreception, low-resolution vision, and high-resolution vision.

Purpose of the Study:

  • To analyze the functional requirements of evolving visual systems.
  • To classify major innovations in eye evolution based on sensory tasks.
  • To propose a model for the evolution of photoreceptors and eyes in Bilateria.

Main Methods:

  • Physical requirement calculations for sensory tasks.
  • Integration of molecular and morphological data.
  • Comparative analysis of Pax-gene expression patterns.

Main Results:

  • Sensory task requirements correlate with major eye evolution innovations.
  • Urbilateria likely possessed simple receptors for directional photoreception.
  • Organ duplication, positional, and functional shifts explain diverse eye patterns.
  • Directional photoreception evolved independently multiple times, including before the bilaterian ancestor.

Conclusions:

  • Eye evolution is a gradual process driven by increasing behavioral complexity.
  • Independent evolution of photoreception occurred multiple times.
  • The evolution of complex eyes was largely complete by the Cambrian period.
  • Secondary eye evolution events are observed in various invertebrate groups.