. A catechism of natural theology. Natural theology; Anatomy. 98 * MECHANISM OF THE BONES. THE UPPER ARM. The upper arm displays a different kind of mechan- ism. It makes a hinge at the elbow, permitting the Fig. Figure 12. o, the humerus, or bone of the upper arm, exhibiting the ball or rounded head at the top, which is received into a socket at the shoulder, forming an universal joint. R, the radius, or bone which turns with the hand, and is hinged at the wrist. u, the ulna, which is hinged at the elbow, and by which we perform all the motions of bending or extending the arm. Figure 13.
. A catechism of natural theology. Natural theology; Anatomy. 98 * MECHANISM OF THE BONES. THE UPPER ARM. The upper arm displays a different kind of mechan- ism. It makes a hinge at the elbow, permitting the Fig. Figure 12. o, the humerus, or bone of the upper arm, exhibiting the ball or rounded head at the top, which is received into a socket at the shoulder, forming an universal joint. R, the radius, or bone which turns with the hand, and is hinged at the wrist. u, the ulna, which is hinged at the elbow, and by which we perform all the motions of bending or extending the arm. Figure 13. A small portion of the humerus, and also of the radius and ulna, exhibiting the structure of the elbow joint. R, being the ra- dius which is loose from the joint, for the purpose of enabling the hand, which is hinged at the opposite extremity, to re- volve. arm to bend : but at the shoulder we have what is called a ball and socket joint ; that is, a universal joint, which will turn in every direction. If we. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nichols, I. (Ichabod), 1784-1859. Boston : W. Hyde
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Keywords: ., bookcentury1800, booksubjectanatomy, booksubjectnaturaltheology
