Article Surfing Archive

Characteristics of bone the primary education fabric of the bone, fabric osseous, is a relatively hard and light composite matter, formed most of the time of calcium phosphate in chemical arrangement named calcium hydroxylapatite (it is the fabric osseous which gives to bones their rigidity). It with the pressure resistance relatively high but the tensile strength poor, meaning it resists to push forces well, but not to draw from the forces. While the bone is primarily fragile, it makes contribute a significant degree of elasticity mainly by collagen. Bleach">All the bones are composed of the cells of life included in the mineral-bearing organic matrix which composes the fabric osseous.

The bone is not a material uniformly full, but rather has some spaces between its hard elements. The hard external layer of bone is composed of compact fabric of bone, of alleged because of its minimal gaps and spaces. This fabric gives to bones their soft, white, and full aspect, and explains 80% of all the mass of bone of a skeleton of adult. The compact bone can also indicated under the name of the dense bone or of the cortical bone. To fill interior of the body is the fabric trabecular of bone (bone cancellous or spongy of a porous network of cells also opened called) which is composed of a network of stem and dish-like the elements which makes the lighter and to allow total body the part for the blood vessels and /courgette marrow.

The bone of Trabecular explains the 20% remainder of the total mass of bone, but has almost ten times the surface of the compact bone. The outside of the bones (except where they act one on the other with other bones by joints) is covered by the p'rioste, which have an external fibrous layer, and a layer osteogenic intern. The p'rioste is richly provided with ships of blood, lymph and nerve, attaching to the bone itself by fibres of Sharpey. Fibres of collagen of bone woven Fibres of collagen of bone woven the bone can also be woven or lamellate (posed). The woven bone is weak, with a restricted number of fibres quickly directed by chance of collagen, but forms and without preexistent structure during periods of repair or growth. The lamellate bone stronger, is made of many piled up layers and is filled of many collagen fibres parallel with other fibres in the same layer.

The fibres function in directions opposed in alternate layers, contributing to the capacity of the bone to resist forces of torsion. After a cut, bone woven form quickly and gradually are replaced by the lamellate bone of slow growth on the preexistent diaphanous cartilage calcified by a known process under the name of 'osseous substitution.'