The pineal and parietal organs of lower vertebrates.
D000200:Action Potentials; D000663:Amphibians / Q000502:physiology*; D000818:Animals; D004594:Electrophysiology; D005399:Fishes / Q000502:physiology*; D008027:Light; D009434:Neural Pathways / Q000033:anatomy & histology; D009474:Neurons / Q000502:physiology; D010296:Parietal Lobe / Q000502:physiology / Q000528:radiation effects; D010786:Photoreceptor Cells / Q000502:physiology*; D010870:Pineal Gland / Q000166:cytology / Q000502:physiology* / Q000528:radiation effects; D012104:Reptiles / Q000502:physiology*; D012160:Retina / Q000502:physiology; D012168:Retinal Pigments / Q000502:physiology; D014466:Ultraviolet Rays
D012168:Retinal Pigments