The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . e. It is composed of two lay-ers, an outer layer of firm tissue, which is simply for THE BONES. 157 support and protection, and an inner layer of inner layer is essential to the life of the bone, andits cells are even capable offorming new bone. In caseswhere it is necessary to re-move a portion of a bone,the surgeon avails himself ofthis fact. He simply peelsback the membrane, removesthe injured bone, and thusleaves the periosteum tomake new bone. The periosteum is wellsupplied with blood
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . e. It is composed of two lay-ers, an outer layer of firm tissue, which is simply for THE BONES. 157 support and protection, and an inner layer of inner layer is essential to the life of the bone, andits cells are even capable offorming new bone. In caseswhere it is necessary to re-move a portion of a bone,the surgeon avails himself ofthis fact. He simply peelsback the membrane, removesthe injured bone, and thusleaves the periosteum tomake new bone. The periosteum is wellsupplied with blood vessels,some of which pass directlyinto the bone through mi-nute openings on the of these openings canbe seen on any bone fromwhich the periosteum hasbeen removed. Compact and Cancellous Tis-sue. If one of the long bonesof any animal be sawedlengthwise, it will be foundto be hollow, except at theends. The hard, thick wall,midway between the ends ofthe bone, is called the com-pact tissue; while thespongy, honey-combed bone,occupying the center of the ends of the bone is called. Fig. 49. Longitudinal sectionof the femur. The spongy, orcancellous bone shows at the ends ;while the compact, hollow boneforms the shaft. 158 THE ESSENTIALS OF HEALTH. the cancellous tissue. The smaller bones and the flatbones are not hollow ; they have an outer layer of com-pact bone, within which is the spongy bone, or cancel-lated tissue.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
