![]() Some flat bones contain irregular structures. They contain a layer of spongy bone covered by a thin layer of compact bone. As the name suggests, they are mostly flat and curved, having a thin plate-like formation. The word sesamoid sounds kind of like sesame seed, and that’s because these seed-shaped bones get their name from a Greek word that means “resembling a sesame seed.” There are 4 sesamoid bones in the adult skeleton:Īdditional sesamoid bones can sometimes form on the tarsal, metatarsal, or incus bones, but this can vary per individual.įlat bones provide protection to vital organs. Sesamoid bones are a special subcategory of short bones that are embedded in tendons. There are 28 short bones in the adult skeleton, consisting of the tarsals and most of the carpals: They consist mostly of spongy bone that is covered by a thin layer of compact bone. ![]() Short bones have approximately the same length and width, which gives them a cube-like appearance. There are 90 long bones in the adult skeleton, consisting mostly of the bones of the upper and lower extremities, as well as the clavicle bones: These bones are going to have a shaft made primarily of compact bone, and two bulky ends, which often contain spongy bone. ![]() These bones can vary in length (short or long), but the key characteristic is that they are longer than they are wide. We also have two minor categories of bones: sesamoid bones and sutural bones.įirst, I’ll talk about the long bones, which is the most common type of bone. We have four major categories: long bones, short bones, flat bones, irregular bones.
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