MICROANATOMY

Detailed explanation-1: -angle of impact = arcsin (stain width/stain length) The width divided by the length equals 0.5. The ArcSin of 0.5 is 30, meaning the blood hit the surface at a 30-degree angle. In a bloodstain measuring 0.04 by 0.16 inches (1 by 4 millimeters), the impact angle comes out to about 14.5 degrees.

Detailed explanation-2: -As the angle of impact gets steeper, the spatter will extend in the direction of the momentum of the drop. Between the angles of 75 and 40 degrees of the impact surface the spines, scallops, and satellites of the spatter are more prominent on the side opposite the angle of impact.

Detailed explanation-3: -As the angle of impact is made smaller or more acute, the bloodstain pattern will become more elongated, elliptical, or oval in shape. The resulting bloodstain’s shape will indicate the direction of travel for that stain and thus, the origin of the drop of blood.

Detailed explanation-4: -The steeper the angle, the longer and thinner the blood drop will be. From very steep angles, we will see very long and thin ovals. At larger angles of impact, we will see more circular shapes.