SKELETON.
CHAPTER XIX.
BONES, SKELETON, ETC.
The bones are the frame-work of the body. Like the muscles, they are generally found in pairs, one for each side of the body. Their number is more than two hundred. When joined together, in their proper position, they make a skeleton, as shown in the picture on page [115], where the names of the principal bones are given.
THE SKULL.—(1) Frontal Bone, (2) Parietal Bone, (3) Temporal Bone, (6) Superior Maxillary (Upper Jaw) Bone, (7) Malar Bone, (9) Nasal Bone, (10) Inferior Maxillary (Lower Jaw) Bone
A bone is composed of animal and mineral substance. The animal part gives it elasticity, and the mineral, hardness. In youth there is more of the animal substance, but it grows less as a person becomes older. This explains why the bones of a child do not break so readily as those of an aged person, and why, when broken, they heal much sooner. Sometimes when a very old man or woman has a limb broken, the bone will not “knit,” or heal at all.
THE CHEST.—(a) The Sternum or Breastbone, (b to c) the True Ribs, (d to f) the False Ribs, (g, h) the Floating Ribs, (i to k) the Dorsal Vertebræ.
THE HAND.—(1) Radius, (2) Ulna, (4-4) Bones of the Wrist, (5-5) Bones of the Hand, (6-6) Bones of the Fingers.