Anatomy and physiology : designed for academies and families . ng the bones, aud shows the relations of each. Let the pupil with the plate before him, point out the situation of thebones in this engraving; give their names, also a general description of each. OSSIFICATION OF THE BONES. 81 The earthy matter of bones gives them solidity and strength,while the animal part endows them with vitality. OSSIFICATION OF THE BONES. The bones experience many changes before they arrive atmaturity. At their early formative stage, they are a cartilage,which is covered by the periosteum. At this period, thev
Anatomy and physiology : designed for academies and families . ng the bones, aud shows the relations of each. Let the pupil with the plate before him, point out the situation of thebones in this engraving; give their names, also a general description of each. OSSIFICATION OF THE BONES. 81 The earthy matter of bones gives them solidity and strength,while the animal part endows them with vitality. OSSIFICATION OF THE BONES. The bones experience many changes before they arrive atmaturity. At their early formative stage, they are a cartilage,which is covered by the periosteum. At this period, thevessels of the cartilage convey only the white portion, orlymph of the blood; subsequently they convey red blood. Atthis time true ossification commences at certain points, whichare called the points of ossification. Most of the bones areformed of several pieces. This is seen in the long boneswhich have their extremities separated from the body by athin partition of cartilage. It is some time before these sepa-rate pieces are united to form one bone. Fig. Fig. 37. A section of the knee joint. The lower part of the shaft of the thighbone, and upper part of the body of the leg bone, are seen ossified at 1,1. 1 he carti-laginous extremities of the two bones are seen at d, d. The points of ossification of theextremities, are seen at 2, 2. The patella, or knee-pan, is seen at c; the point whereossification commences, is seen at 3. What are the different uses of the component parts of bone ? Do boneschange previous to maturity ? When they are cartilaginous what fluid passe*through them ? When does true ossification commence ? 82 ANATOMY AND PHYSIOLOGY. When the ossification is completed, the hones still continueto undergo different changes. They increase in bulk, andbecome less vascular, until middle age. In advanced life, theelevations upon their surface and near the extremities becomemore prominent, particularly in individuals accustomed tolabor. As a person advances in years,
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
