pics and info from here! loads more information at the source
The placements are approximate. You can see that the Obicularis Oculi and Corrugator muscles are pretty much the same. The Palpebral muscle is not the same. Also, the Orbital Septum which lies behind the Obicularis are differently sized. In a Caucasian, this is shorter and in an Asian longer thus making the crease non existent or just a slight fold. Behind the Orbital Septum is also the Orbital Fat that I mentioned. Since the Orbital Septum is longer, the Orbital Fat extends from the browbone to almost the lid. There is also a longer layer of fat on the browbone area. And, Asians also have an extra layer of fat on the lid area right beneath the skin which blocks the formation of a crease whereas Caucasians do not. This is three layers of fat which sadly as one ages can go in the opposite direction and become hollowed out and sunken in. Some Asians also have an Epicanthal Fold which hides the tear duct.