Powered by django-wiki, an open source application under the GPLv3 license. This article was last modified: March 15, 2023, 5:22 p.m. Other muscles are used for smiling, yawning, and lots of facial expressions.įigure 1: The skull is made from flat bones. Some muscles allow us to open our mouths and bite down with force. Long bones provide the leverage we need for moving our bodies and for manipulating our environment. The clavicles (collar bones) are also long bones. Long bones of the leg include the femur, tibia, fibula, metatarsals, and phalanges. Muscles attach to the skull at different locations. Long bones in the arm include the humerus, radius, ulna, metacarpals, and phalanges. The combination of compact and spongy bone is important because flat bones have numerous muscle attachment points that pull in different directions, so they need to be able to withstand forces in different directions.įor example, the skull is made of flat bones and irregular bones. The hard outer layer provides protection from direct forces, while the spongy bone center allows these bones to absorb forces coming from different directions as well. Red bone marrow is contained within the spongy bone. These bones are constructed in a sandwich-like manner, with hard compact bone on the outside and spongy bone on the inside. The skull, ribs, and sternum are all made from flat bones. Flat bones are a type of bone that protects internal organs. Flat bones make up the skull But rib bones are flat And finally, the ribs are 12 paired flat bones that form the lateral or sidebars of the cage Spongy bone.
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