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Related Concept Videos

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.
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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.
Indirect Motor Pathways01:22

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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...
Direct Motor Pathways01:11

Direct Motor Pathways

The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
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...

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Related Experiment Video

Updated: May 25, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Visual pathways serving motion detection in the mammalian brain.

Alice Rokszin1, Zita Márkus, Gábor Braunitzer

  • 1Department of Physiology, Faculty of Medicine, University of Szeged, H-6720 Szeged, Hungary. alice@phys.szote.u-szeged.hu

Sensors (Basel, Switzerland)
|February 10, 2012
PubMed
Summary

This review explores visual motion perception, focusing on feline and macaque brain structures. It highlights the tectofugal system

Keywords:
ascending tectofugal systemcaudate nucleusdorsal streammotion detectionposterior thalamusventral stream

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Published on: August 1, 2018

Area of Science:

  • Neuroscience
  • Visual Perception
  • Comparative Anatomy

Background:

  • Motion perception is crucial for navigating the dynamic visual world.
  • Visual information travels from the retina through various brain structures to higher cortical areas.
  • Understanding these pathways is key to deciphering visual processing.

Purpose of the Study:

  • To review the extrageniculo-extrastriate cortical and subcortical visual structures in feline and macaque brains.
  • To discuss the functional roles of these structures in visual motion perception.
  • To emphasize the ascending tectofugal system's potential role in self-motion perception.

Main Methods:

  • Literature review of neuroscientific studies.
  • Comparative analysis of visual pathways in felines and macaques.
  • Focus on extrageniculo-extrastriate pathways.

Main Results:

  • Identified key cortical and subcortical structures involved in motion processing.
  • Detailed the functional contributions of these areas to visual motion perception.
  • Highlighted the significance of the tectofugal system for environmental awareness during self-motion.

Conclusions:

  • The extrageniculo-extrastriate pathways play a significant role in visual motion perception.
  • The tectofugal system is a critical component for detecting the environment during self-motion.
  • Further research into these pathways can advance our understanding of visual processing.