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Many biological and biochemical, physiological and behavioral indicators are showing circadian fluctuations, this close to the 24-hour period changes in biological rhythms, called a circadian rhythm. Organisms Circadian control by the circadian clock (circadian clock). The conventional view is that the most important hub crawling animal circadian clock is the pineal gland and retina, researchers mainly focus on the pineal gland and retina. In recent years, studies have shown that damage to the side of the eye (retina), pineal gland (gland), most lizards reptile physiological functions and behavior still has a significant circadian rhythm (Innocenti, 1993; Berk and Heath, 1975; Tosini and Menaker, 1998), some nuclei of the hypothalamus injury can completely destroy the circadian rhythm of some reptiles, most scholars believe that the hypothalamus may also be important crawling animal circadian clock oscillator. Posterior pituitary hormone is widely exists in each level of the vertebrate taxa ancient hormone, arginine vasopressin (arginine vasopressin, AVP) biological clock important and stable output signal and integrated signal mammals ( Hofman, 2003; Dunlap, 1999; Hastings et al, 2003; Maria, 2003), under different photoperiod in the suprachiasmatic nucleus showed characteristic circadian expression. The arginine vasopressin oxytocin (arginine vasotocin, AVT) as arginine pressurized factors in reptiles congeners, whether express its in webbed gecko (Gekko swinhonis) hypothalamus? Its expression is presented circadian rhythmicity ? different light cycle, and its expression in different temperature change it? using immunohistochemistry and mathematical morphology method, we found in G. swinhonis brain AVP immunoreactive cells are mainly distributed in the Lucas diagonal band nucleus, depending on nucleus, paraventricular nucleus in the room weeks, as the former area, the bed nucleus of the stria terminalis, lateral hypothalamic area, the lateral forebrain bundle, periventricular nuclear few scattered cells; positive cells varied shapes, rounded, pear shape, or bipolar shape, but more to the main round, immunostaining mainly located in the cytoplasm and cell processes, the nucleus is not colored or pale coloring. AVP immunoreactive fibers in the olfactory bulb, olfactory tract, the cerebral cortex, the optic lobes, cerebellar cortex no, almost throughout other parts of the whole brain. Making on the basis of the whole brain AVP immunoreactive cellular localization and projection fibers observed, we select the reptiles have all reported AVT expression of the two nuclei (supraoptic nucleus and paraventricular nucleus)
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