. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. 28 FHTSIOLOQT AND TEMPERANCE. r' ? This is due to the shallowness of the joint, to its exposed position, and to the varied functions of the arm. 20. The Elbow.—The elbow presents the best instance of the forward and backward movements of a hinge. It is formed by the lower end of the humerus and the upper ends of the ulna and radius. The arm bone at its lower extremity is wide and flat, while at its very end is a rounded, smooth surfa
. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. 28 FHTSIOLOQT AND TEMPERANCE. r' ? This is due to the shallowness of the joint, to its exposed position, and to the varied functions of the arm. 20. The Elbow.—The elbow presents the best instance of the forward and backward movements of a hinge. It is formed by the lower end of the humerus and the upper ends of the ulna and radius. The arm bone at its lower extremity is wide and flat, while at its very end is a rounded, smooth surface, which fits into a deep notch in the ulna. The radius is quite small at this end, and forms very little of the elbow joint. With its smooth head it rolls against the side of the ulna as we turn the palm of the hand upward or downward. Iliii: !i I. Fie. 8.—The Wrist Joint. 21. The Wrist.—When we come to the wrist, we find the relative size of the two bones is changed. Here the ulna is quite small, and rolls in a similar way against the side of the radius when the hand is turned. The end of the radius is sufficiently large to form the whole upper surface of the wrist joint. The bones of the wrist are small and mostly wedge- shaped. They are arranged in two rows of four bones each, and are so placed as to form a gentle curve when the wrist is bent, giving it a graceful outline, instead of a sharp angle, as in the ordinary hinge joint. 22. The Hand.—In the hand, including the thumb and fingers, we see displayed the most perfect and complete meoh- L. 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 Nattress, William; Ontario. Dept. of Education. Toronto : W. Briggs
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