Upper Arm Bone and Colorized Scan of Bone Tissue (image) University of Washington Share Print E-Mail Caption This is the humerus, or upper arm bone, of Nyasasaurus parringtoni next to a cross section of the bone. The many colors indicate that the bone fibers are disorganized, much like those of early dinosaurs. Credit (c)Natural History Museum Usage Restrictions Credit required Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.