Structure of Bone Tissue. There are two types of bone tissue: compact and spongy. The names imply that the two types differ in density, or how tightly the tissue is packed together. There are three types of cells that contribute to bone homeostasis.
A typical long bone shows the gross anatomical characteristics of bone. The wider section at each end of the bone is called the epiphysis (plural = epiphyses), which is filled with spongy bone. Red marrow fills the spaces in the spongy bone.
Compact bone is the denser, stronger of the two types of bone tissue ( (Figure) ). It can be found under the periosteum and in the diaphyses of long bones, where it provides support and protection. (a) This cross-sectional view of compact bone shows the basic structural unit, the osteon.