Picture of the pathomechanism of Raynaud's phenomenon. This disorder is caused by vasospasmic malperfusion and causes a discoloration of the fingers, toes and sometimes other areas. On the left side you can see the normal blood supply but on the right side the pathomechanism of constricted digital arteries.
Quelle: National Heart, Lung, and Blood Institute: Heart & Vascular Diseases: Raynaud's: What Is Raynaud's?