Help me! please ,surrounded by tracing the evolutionary bridleway.....?

why our thumbfinger has its position at right angle to the remaining fingers ?does it enjoy any evolutionary significance?Moreover ther is alot difference in the arrangement BONES surrounded by leg n hand.can you explain that difference.[not contained by functional aspects]Help me! please ,surrounded by tracing the evolutionary bridleway.....?
It's evolutionary function would be to have a more stable intercontinental orientated grip when climbing trees and rocks. Since are ancestors were essentially nomadic, they would have to hold had an rationalized hand structure that would allow them to use their digits for consumption, holding, fighting etc...
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