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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...
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...
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,...
Muscles of the Eye01:20

Muscles of the Eye

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
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...
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.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: Jul 2, 2026

VisualEyes: A Modular Software System for Oculomotor Experimentation
10:41

VisualEyes: A Modular Software System for Oculomotor Experimentation

Published on: March 25, 2011

Mapping the oculomotor system.

Jean A Büttner-Ennever1

  • 1Institute of Anatomy, Ludwig-Maximilian University of Munich, 80336 Munich, Germany. jean.buettner-ennever@med.uni-muenchen.de

Progress in Brain Research
|August 23, 2008
PubMed
Summary

Researchers identified key cell groups in the oculomotor system, including excitatory and inhibitory burst neurons (EBNs, IBNs) and omnipause neurons (OPNs), crucial for saccadic eye movements.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • The oculomotor system controls eye movements, with specific neuronal populations responsible for saccades.
  • Understanding the precise location and function of these neurons is vital for diagnosing and treating eye movement disorders.

Purpose of the Study:

  • To morphologically identify and characterize functional cell groups within the oculomotor system.
  • To differentiate between motoneuron types innervating different muscle fibers.
  • To establish a neuroanatomical basis for understanding human eye movement disorders.

Main Methods:

  • Utilized tract tracing techniques, including rabies virus, for cell group identification.
  • Performed detailed morphological studies of extraocular motoneurons.

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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

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Related Experiment Videos

Last Updated: Jul 2, 2026

VisualEyes: A Modular Software System for Oculomotor Experimentation
10:41

VisualEyes: A Modular Software System for Oculomotor Experimentation

Published on: March 25, 2011

Video-oculography in Mice
09:43

Video-oculography in Mice

Published on: July 19, 2012

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
08:27

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

  • Characterized cell groups in monkey brains to identify homologous structures in humans.

    • Main Results:

    • Identified horizontal excitatory and inhibitory burst neurons (EBNs, IBNs) in the PPRF and vertical EBNs in the RIMLF.
    • Characterized omnipause neurons (OPNs) in the nucleus raphé interpositus.
    • Differentiated two types of extraocular motoneurons (SIFs and MIFs) with distinct premotor afferents and functions.
    • Mapped homologous cell groups in the human brainstem based on monkey studies.

    Conclusions:

    • Established the precise localization and function of critical cell groups involved in saccade generation.
    • Demonstrated functional differences between motoneuron types based on muscle fiber innervation.
    • Provided a neuroanatomical foundation for understanding and potentially treating clinical eye movement disorders.