Medical dictionary. 2011.
parapineal organ — the left side counterpart of the pineal organ, q.v., in the dorsal midline between the telencephalon and the optic lobes. It is reduced or absent in some fishes … Dictionary of ichthyology
parapineal — Beside the pineal; denoting the visual or photoreceptive portion of the pineal body present, if not functioning, in certain lizards. * * * para·pin·e·al (par″ə pinґe əl) pertaining to the parapineal organ of certain lower… … Medical dictionary
parietal organ — parapineal o … Medical dictionary
pineal organ — the light sensitive dorsal evagination of the diencephalon part of the brain. See also epiphysial apparatus. This large and dark body lies to the right of the midline while its left side counterpart is the parapineal, not always present or… … Dictionary of ichthyology
Opsin — Three dimensional structure of bovine rhodopsin. The seven transmembrane domains are shown in varying colors. The chromophore is shown in red. Opsins are a group of light sensitive 35–55 kDa membrane bound G protein coupled receptors of the… … Wikipedia
epiphyseal eye — a modification of the parapineal organ of certain lower vertebrates to form an eyelike structure lying subepidermally on the median dorsal aspect of the head; it is a photoreceptor rather than an image forming eye, enabling the organism to… … Medical dictionary
Parietal eye — A parietal eye, also known as a parietal organ or third eye is a part of the epithalamus present in some animal species. The eye may be photoreceptive and is usually associated with the pineal gland, regulating circadian rhythmicity and hormone… … Wikipedia
