Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
|
 |
|
Hamasaki, D. I., & Dodt, E. (1969). Light sensitivity of the lizard's epiphysis cerebri. European Journal of Physiology, 313(1), 19–29. Added by: Sarina (2009-04-02 15:46:39) Last edited by: Sarina (2012-11-28 16:22:09) |
| Resource type: Journal Article DOI: 10.1007/BF00586325 BibTeX citation key: Hamasaki1969a View all bibliographic details  |
Categories: Englisch = English Keywords: Echsen = Lizards, Parietalorgan = Parietal Organ Creators: Dodt, Hamasaki Collection: European Journal of Physiology |
Views: 5/1309 Views index: % Popularity index: 0.5% |
| Abstract |
|
Physiological findings indicate that the lizards parietal eye is a functional photoreceptor displaying a complicated pattern of slow (graded) responses during adaptational changes and opposite patterns of impulse activity in response to blue and green light. In addition to the parietal eye a pineal organ (epiphysis cerebri) is present in lizards, ultrastructurally consisting of some essentially normal and of many decomposed and degenerated outer segments. Recording by stainless steel needles inserted into theepiphysis cerebri ofLacerta sicula campestris, Acanthodactylus erythrurus andIguana iguana after removal of the parietal eye revealed photic responses differing from those of the parietal eye by being purely inhibitory in response to all light stimuli and showing an absolute intensity threshold within the photopic range (4 lm/m2) and maximum sensitivity at about 600 nm. After allowance is made for the vascular filter effect of blood in front of the epiphysis a shift of maximum sensitivity is obtained to shorter wavelengths indicating the presence of a similar photopigment in the photoreceptors of theepiphysis cerebri as in the lateral eye (lambda max 570 nm). Key-Words Light Sensitivity - Pineal Organ - Lizards Added by: Sarina Last edited by: Sarina |