Show Summary Details
Page of

The Visual System 

The Visual System
Chapter:
The Visual System
Author(s):

Per Brodal

DOI:
10.1093/med/9780190228958.003.0016
Page of

PRINTED FROM OXFORD MEDICINE ONLINE (www.oxfordmedicine.com). © Oxford University Press, 2021. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Medicine Online for personal use (for details see Privacy Policy and Legal Notice).

date: 26 February 2021

Chapter 16 describes the visual system, from the receptors in the eye to the cerebral cortex. The photoreceptors transform light energy to graded changes of the membrane potential with ensuing release of glutamate. From the photoreceptors, the signals pass to bipolar cells and from these to retinal ganglion cells. The rods are responsible for vision in dim light, whereas the cones require daylight and are necessary for perception of visual details and colors. The retinal ganglion cells leave the eye in the optic nerve and end in the lateral geniculate body. From the lateral geniculate nucleus, signals travel in the optic radiation to the striate area (primary visual cortex). The visual pathways show a precise, retinotopical organization. The area striata performs the first analysis of the visual information, while further processing takes place in extrastriate visual areas.

Access to the complete content on Oxford Medicine Online requires a subscription or purchase. Public users are able to search the site and view the abstracts for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.