Compact bone consists of cylindrical units called osteons. Compact bone is the hard material that makes up the shaft of long bones and the outside surfaces of other bones.There are two kinds of bone tissue (see Figure 1): Quiz: Regulation of Urine Concentration.Quiz: Structure of the Digestive Tract Wall.Quiz: Function of the Respiratory System.Quiz: Structure of the Respiratory System.Quiz: Supplements to the Immune Response.Quiz: Humoral and Cell-Mediated Immune Responses.Humoral and Cell-Mediated Immune Responses.Quiz: Specific Defense (The Immune System).The Immune System and Other Body Defenses.Quiz: Functions of the Cardiovascular System.Quiz: The Hypothalamus and Pituitary Glands.Quiz: The Ventricles and Cerebrospinal Fluid.Quiz: Muscle Size and Arrangement of Muscle Fascicles.Muscle Size and Arrangement of Muscle Fascicles.Quiz: Structure of Cardiac and Smooth Muscle.Quiz: Connective Tissue Associated with Muscle Tissue.Connective Tissue Associated with Muscle Tissue.Quiz: Chemical Reactions in Metabolic Processes.Chemical Reactions in Metabolic Processes.Quiz: Atoms, Molecules, Ions, and Bonds.The intervening cancellous tissue is called the diploë, and this, in certain regions of the skull, becomes absorbed so as to leave spaces filled with air between the two tables. In an adult, most red blood cells are formed in flat bones. These bones are composed of two thin layers of compact bone enclosing between them a variable quantity of cancellous bone, which is the location of red bone marrow. In the cranial bones, the layers of compact tissue are familiarly known as the tables of the skull the outer one is thick and tough the inner is thin, dense, and brittle, and hence is termed the vitreous table. The flat bones are: the occipital, parietal, frontal, nasal, lacrimal, vomer, scapula, os coxæ, sternum, and ribs. These bones are expanded into broad, flat plates, as in the cranium, the ilium, sternum, rib cage, the sacrum and the scapula. Freebase Rate this definition: 4.0 / 1 voteįlat bones are bones whose principal requirement is either extensive protection or the provision of broad surfaces for muscular attachment.

Flat bone definition