The compact bone is made up of osteons that are tightly packed. Basically, these two types of bone tissue differ in terms of density. To understand the structure of flat bones, one needs to understand the difference between a compact bone and a spongy bone. Most of them provide protection to the soft tissues or vital organs that lie under them. These are curved and have a large surface for muscle attachment. Structure of Flat Bones in the Human BodyĪs the name suggests, flat bones are strong flattened plates of bone. The flat bones are thin, as well flattened. Hyoid bone and the vertebrae are examples of irregular bones. Irregular bones, as the name suggests, have an irregular shape. Patella (kneecap) is an example of a sesamoid bone. Sesamoid bones are small bones that are embedded in some tendons. The cube-shaped short bones include the carpals, tarsals, metacarpals, metatarsals, and phalanges. The long bones include femur, tibia, fibula, radius, ulna, and humerus. The bones of the human body are classified into long bones, short bones, sesamoid bones, flat bones, irregular bones, and wormian bones (intra-sutural).
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