| Abstract: | In order to explore the development of melanocytes (MC) in comparative systematic biology, so as to make a further understanding of the function of MC and diseases related to MC, we made a comparative study through pathological and TEM technique, on morphology of MC in different vertebrate animals, such as fish class (finel eel), amphibious animal (matured and immatured bulldog and frog), reptilian (turtle, walzard), aves (chicken) and mammalia (white mice, human embryo and adult in formative process of vertibate evolution.). The results showed that histologically, from the fish to amphibious animal, reptilia, and mammalia. MC were increased in number gradually, forming from stellar, polygonal form to more regular form with cell body growing smaller and dendrites growing from pyknic to slender with a gradual increase of branches, MC also scattreed differently and the organells developed more with evolution. These suggest that the change of MC in the evolution process of vertebrates may be related to the gradual adapte to alteration of living environment from water to land. As to the sunlight and ultraviolet ray increases. It also proves, on the other hand, that MC has the effect of blocking or to get shed of the sun. |
