Bibi,atrophy is usually well seen as general decrease of muscle mass. The limb looks more like bone wrapped in the skin. Residual muscles lost their tonus. Normally atrophy means that clinical weakness occurs too as this means that muscles can ot work.Decrease in diameter is REALYY significant, and the bones become really prominent.Many people take subcutaneous fat atrophy for muscle atrophy, but fat atrophy only makes weins and tendons more visible and does not look like a sceleton wrapped in skin and some muslces.