No, the temporal bone is not a flat bone. In an adult, most red blood cells are formed in flat bones. These bones are expanded into broad, flat plates, as in the cranium (skull), the ilium (pelvis), sternum and the rib cage. The flat bones include the scapula (wingbone), the ribs, and the sternum (breastbone).įlat bones are bones whose principal function is either extensive protection or the provision of broad surfaces for muscular attachment. Flat bones: Flat bones are thin and have broad surfaces. Medical Definition of Bone type The major bones of the arms (humerus, radius, and ulna) and the legs (the femur, tibia, and fibula) are all long bones. Examples of irregular bones are the vertebrae, hip bones, and several skull bones. These bones may have short, flat, notched, or ridged surfaces. Irregular bones are bones with complex shapes. The function of flat bones is to protect internal organs such as the brain, heart, and pelvic organs.Įxamples of flat bones are the sternum (breast bone), ribs, scapulae (shoulder blades), and the roof of the skull (Figure 1). There are flat bones in the skull (occipital, parietal, frontal, nasal, lacrimal, and vomer), the thoracic cage (sternum and ribs), and the pelvis (ilium, ischium, and pubis). This bone forms the back of your skull.ġ. You have two parietal bones on either side of your head. This bone forms your forehead and the upper portion of your eye sockets.
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