Bone is living tissue that makes up the body's skeleton. There are three types of bone tissue, including the following:
The tough, thin outer membrane covering the bones is called the periosteum. Beneath the hard outer shell of the periosteum there are tunnels and canals through which blood and lymphatic vessels run to carry nourishment for the bone. Muscles, ligaments, and tendons may attach to the periosteum.
Bones are classified by their shape--as long, short, flat, and irregular. Primarily, they are referred to as long or short.
There are 206 bones in the human skeleton, not including teeth and sesamoid bones (small bones found within cartilage):
Bone provides shape and support for the body, as well as protection for some organs. Bone also serves as a storage site for minerals and provides the medium--marrow--for the development and storage of blood cells.
The different types of bone cells include the following:
Fat cells are also found within the bone marrow.
Because of the complexities of a bone's function, from providing strength and support for the body, to serving as a site for development and storage of blood cells, there are many disorders and diseases that can affect bone.
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