In other bones it contains blood-forming cells. In some bones the marrow is only fatty tissue. New bone is always forming while old bone is dissolving.
Osteoclasts are cells that dissolve old bone.īone often looks as if it doesn’t change much, but it's actually very active. Osteoblasts are cells that lay down new bone. In adults, cartilage is mainly found at the end of some bones that are part of a joint.Ĭartilage can also be found in other parts of the body, such as on the ends of the ribs, in parts of the nose and ears, and in the trachea (windpipe) and larynx (voice box). This cartilage, along with ligaments and other tissues connect bones to form a joint. After the bone is formed, cartilage may remain at the ends to act as a cushion between bones. Cells in the body then lay calcium down onto the cartilage to form bone. Most bones start out as a softer, more flexible form of tissue called cartilage. The tissue lining the medullary cavity is called endosteum. Some bones have a space inside called the medullary cavity, which contains the soft, spongy tissue called bone marrow (discussed below). 
The outside of the bone is covered with fibrous tissue called periosteum. The hard, outer layer of bones is made of compact (cortical) bone, which covers the lighter spongy (trabecular) bone inside. Bone is the supporting framework for your body.
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