Emu

Image of bone from the femur (thigh) of an Emu, a large flightless bird from Australia. The image was acquired by incident optical microscopy of a rough cut block surface of the bone.

The image has been color coded according to depth in the bone. Dark blue-to-black illustrates a deep plexus of vascular canals, coursing more or less from left to right, that run circumferentially around the bone. Light blue striae represent near-surface marks left by the sawing of the bone and yellow striae are such marks at the very top surface of the bone block.