The eye is a peripheral part of the visual analyzer. It consists of an eyeball which walls form three covers. External represents a fibrous cover. Its forward transparent part is called as a cornea having a spherical surface. Its other part - склера is an external skeleton of the eye, providing to it the certain form. ceftin 500bupropion 150 On 1 см2тыльной at the inhabitants living in a midland of Russia, it is necessary a surface of a hand 11 - 13 холодовых and 1 - 2 thermal receptors. At холодовых receptors the constant импульсация is observed in a range from 41 to 10°С, and optimum sensitivity - in limits from 15 to 30°С. Thermal receptors react constant frequency ПД in a range from 20 to 50°С with optimum sensitivity within 34 - 42°С. It is static reaction of receptors. Temperature changes on 0,2°С cause changes импульсации receptors towards its reduction or increase. Such reaction of thermoreceptors is called as dynamic.