Anatomy and physiology : designed for academies and families . eri, around, and kranon, the skull. composition of the bones. The bones consist of a mixture of earthy and animal matter;the existence of the first being proved by burning them. Bythis process they are rendered white, their weight is lessened,and they become brittle, from the absence of animal which remains is composed of the carbonate and phos-phate of lime. The animal part can be made evident byimmersing a bone in weak acid. This dissolves the salts oflime, and there remains a cartilaginous body, flexible andelastic,
Anatomy and physiology : designed for academies and families . eri, around, and kranon, the skull. composition of the bones. The bones consist of a mixture of earthy and animal matter;the existence of the first being proved by burning them. Bythis process they are rendered white, their weight is lessened,and they become brittle, from the absence of animal which remains is composed of the carbonate and phos-phate of lime. The animal part can be made evident byimmersing a bone in weak acid. This dissolves the salts oflime, and there remains a cartilaginous body, flexible andelastic, retaining the same form as the bone, and, like cartilageor gristle, it may be knotted. How many metatarsal? What form does the union of the bones give thefoot ? What protection does it give ? How many phalanges ? How manyranges of bones have the toes ? How many the great toe ? Describe th»periosteum. Does this membrane possess sensibility ? What is it called onthe skull ? Of what are the bones composed ? How demonstrated ? 80 ANATOMY AND Fig. 36. Gives a fine view of a perfect skeleton, with the outlines of the soft tissue*surrounding 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
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
