Extraocular Photoreception

  • M. Yoshida
Part of the Handbook of Sensory Physiology book series (SENSORY, volume 7 / 6 / 6 A)


Light affects animal life in diverse ways. Photic information is perceived through eyes in some animals, but in others photosensitivity is mediated through an extraocular surface. Such sensitivity, called the dermal or diffuse light sense, is known to exist in most of the major phyla, and a remarkable variety of biologically significant photoreactions ensue, escape from predators, attack on prey, search for a more suitable habitat, initiation of spawning, maintenance of circadian rhythm, control of endocrine activities, etc. We will be concerned here only with the short-term effects of light, and with some of the principal types of responses.


Ventral Nerve Cord Visceral Ganglion Phototactic Behavior Radial Nerve Cord Photoreceptive System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag, Berlin · Heidelberg 1979

Authors and Affiliations

  • M. Yoshida
    • 1
  1. 1.Tamano, OkayamaJapan

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