According to Reference.com, the cavity within a bone is called the medullary cavity. This is the place where bone marrow is found and red blood cells and white blood cells are formed.
The medullary cavity is surrounded by spongy bone and a thin membrane. Inside this cavity is soft, fatty bone tissue called bone marrow, as HowStuffWorks explains. There are two types of bone marrow: red and yellow. Red bone marrow is made up of hematopoietic stem cells and stromal stem cells. The job of stem cells is to replace and grow into specialized cells. Hematopoietic cells are largely responsible for becoming new blood cells. They replenish both the red and white blood cell counts as well as the platelets. Sometimes these stem cells even create more stem cells, depending on the need. Stromal stem cells, on the other hand, create connective tissue cells, fat cells and bone cells. Yellow marrow is made up mostly of fat, although it can transform into red marrow and produce blood cells if needed.
HowStuffWorks points out that sometimes blood marrow can become diseased, causing disorders such as aplastic anemia and myelodysplastic syndromes, which keep the body from being able to create sufficient blood cells.Learn More
The shaft of a long bone is called the diaphysis. The narrow shaft transitions into regions called metaphyses, which terminate in broad, substantial areas of bone called epiphyses. These epiphyses form joints with other bones.Full Answer >
According to Encyclopædia Britannica, a mature bone cell is called an osteocyte. These cells, which are found in fully formed bone, develop from the bone-forming cells known as osteoblasts.Full Answer >
Midlands Technical College states that the medullary cavity is a hollow space in the middle of some bones. The medullary cavities hold bone marrow, an important substance that produces blood cells, among other activities. Wikipedia states that this hollow cavity is also called the medulla or marrow cavity in some cases.Full Answer >
Living bone contains about 10 to 20 percent water and 60 to 70 percent bone mineral, as explained by the University of Cambridge. The remaining material is mostly collagen with trace amounts of proteins and inorganic salts.Full Answer >