Frontomethiod Fragment
Flat and Irregular bone; part of the axial (core) skeleton
Also known as: Skull fragment, specifically from the forehead and sinus area
Classification
Flat and Irregular bone; part of the axial (core) skeleton
Dimensions
This fragment belongs to a larger structure that protects the brain and forms the upper sockets of the eyes. Proportionally, it is thin and scooped, with complex hollowed-out chambers.
Key Features
The most striking feature of this fragment is its curved, scooped internal surface and the presence of 'cells' or hollow compartments. It looks somewhat like a heart or a butterfly wing with a central hole. One side is smoother (the outer face), while the inner side is deeply textured and pitted where it would have lined a sinus or brain cavity.
Similar Bones
This might be confused with a piece of a pelvic bone or a broken vertebra. However, pelvic bones are usually much denser and thicker at the connection points, and vertebrae have a distinct central hole for the spinal cord that is surrounded by much more substantial, solid bone rather than these delicate, thin-walled chambers.
Across Species
In mammals like deer or cattle, these bones are often thick to support antlers or horns. In contrasts, bird skull bones are incredibly thin and often fused to save weight for flight. Fish have skulls made of many small, overlapping plates. This specific specimen features 'honeycombed' spaces, which are common in many land animals to keep the skull light while maintaining strength.
Evolutionary History
The skull began as a series of protective plates in ancient fish like the placoderms. Over millions of years, these plates fused and specialized into the complex, multi-layered vault we see in modern mammals. The hollowed-out sinus cavities seen in fragments like this evolved to lighten the weight of the head while allowing for larger brain cases.
Photography Tips
When photographing skull fragments, place a common object like a coin or a ruler next to the piece to show its size. Take one photo looking directly down into the hollowed side and another from the side to show the thickness and curvature. Using a soft, natural side-light will help highlight the internal texture and chambers.