File:Applied anatomy and kinesiology; the mechanism of muscular movement (1919) (14595760558).jpg

Identifier: appliedanatomyk00bowe (find matches)
Title: Applied anatomy and kinesiology; the mechanism of muscular movement
Year: 1919 (1910s)
Authors: Bowen, Wilbur Pardon, 1864-1928
Subjects: Exercise Muscles Physical education and training
Publisher: Philadelphia, Lea & Febiger
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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umerus; flexion is limited by contact of the muscleson the front of the arm. Some individuals can overextend the armat the elbow while others cannot fully extend it, the differencebeing due mainly to occupation, habitual position of the joint andvariation in the laxness of ligaments. The capsule of the joint isreinforced by strong bands of connective tissue on the outer andinner sides. The radio-ulnar union is a double pivot joint, the radius rota-ting in a ligamentous ring at the elbow and the lower ends of thetwo bones describing semicircles around each other at the wrist.The ulna cannot rotate at the elbow and the radius cannot rotate 116 MOVEMENTS OF ELBOW AND FOREARM at the wrist, yet by means of the pecuHar manner of union betweenthe two the hand can turn through nearly ISO degrees. This,together with the 90 degrees of rotation possible in the shoulder-joint, makes it possible to turn the hand through almost 270 degreeswhen the elbow is extended. The position with palm upward is
Text Appearing After Image:
Fig. 65.—Muscles on the back of shoulder and arm. (Gerrish.) called the supine position, and the rotation of the forearm inwardand upward to this position is called supination; the position withpalm downward is called the prone position of the arm, and therotary movement to this position is called pronation.There are five muscles acting on the elbow-joint; two of these TRICEPS 117 also have some action on the shoulder-joint and two act also onthe radio-ulnar union. Two muscles act on the radio-ulnar uniononly, giving the following list: rihnir J Extension Radio- Supination ulnar < Union Pronation

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