File:Anatomy, physiology and hygiene (1900) (14592380968).jpg

Identifier: anatomyphysiolog00walk (find matches)
Title: Anatomy, physiology and hygiene
Year: 1900 (1900s)
Authors: Walker, Jerome, 1845-
Subjects: Physiology Health
Publisher: Boston, Allyn and Bacon
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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e substance remaining in theshape of the bone will crumble when touched. 1 Bone has been found by experiment to possess twice the resistingproperty of solid oak. It is also elastic, as is shown by the resiliency ofthe fibula when its shaft is pressed against its tibia ; and by Mr. Wardsexperiment of placing the clavicle at right angles against a hard body,and striking the free end a smart blow with a hammer, when the bonewill rebound a distance of two feet. — G. M. Humphrey, Treatise onthe Skeleton. 2 Bones of children are apt to be bent by prolonged and repeatedweight and strain upon them. BONES AND JOINTS. 37 Joints are classified as immovable, mixed, and movable.The joints of the cranial bones,1 called sutures or dovetailjoints, are immovable; 2 those of the vertebrae are mixed.Most of the other joints of the body are movable. Thevarieties of these are the ball and socket joints, of whichthe shoulder and hip are examples; and hinge joints, towhich class the knee and elbow belong.
Text Appearing After Image:
Fig. 12.Suture Joints of the Skull. Fig. 13.Hip Joint (Ball and Socket). 31. The skull rests and nods upon the first vertebra,or atlas. It also rests upon a tooth-like process of theaxis, or second bone of the spinal column, which projectsupwards through a hole in the atlas and forms a pivot, or 1 Upper bones of skull (Fig. 12). 2The upper bones of the skull of a baby do not unite until monthsafter birth, in order to allow the brain to grow. The dovetail joints Laterin life fasten these bones together very firmly, so that an adult can carryconsiderable weight upon the head without injury. 38 BONES AND JOINTS. swivel, upon which the head rotates, or turns from side toside, the atlas also turning with it.

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