24 - Note arrived 12:22pm Frog retina W area vs B area W...

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Note: arrived 12:22pm 4-4-08 Frog retina W area vs. B area W area ---no inhibition of the pars intermedia hence stays light Evolution of color change mechanisms in vertebrates -solid bars are hormonal mechanisms -dashed are hormonal and neural -dotted are neural only -one can see the trend is towards neural control of pigmentation and that it is a later accusation. While __________ was the ancestral form. ----------------------------------------------------------------------------------------------------------- ------- α -MSH (melanotropin) in reptiles Unlike amphibians there is no direct inhibitory input But there is some innervation of skin cells As in fishes these color changes can be under endocrine or neural control. Response is variable α -MSH seems to be the main mechanism directly into the skin to change color on the carolina alanol?? Take home msg: it is variable, in some species it is neural while in others its humoral. α -MSH (melanotropin) in birds Pars intermedia in birds is most often lacking in adult form and thought of as an enigma
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