Applied anatomy and kinesiology, the mechanism of muscular movement . m this position, and see how the tuber-osity is carried to the rear over the rounded edge of the socket to MOVEMENTS OF THE SHOULDER-JOINT 83 a place where it no longer prevents elevation of the back to starting-point and observe that elevation forward,with palms toward each other, does not cause the tuberosity tomeet any solid obstruction. Having been raised from the side, the arm can be swung for-ward (flexion of shoulder-joint) until it strikes the front of the chest,swung backward to the lateral plane (extensi
Applied anatomy and kinesiology, the mechanism of muscular movement . m this position, and see how the tuber-osity is carried to the rear over the rounded edge of the socket to MOVEMENTS OF THE SHOULDER-JOINT 83 a place where it no longer prevents elevation of the back to starting-point and observe that elevation forward,with palms toward each other, does not cause the tuberosity tomeet any solid obstruction. Having been raised from the side, the arm can be swung for-ward (flexion of shoulder-joint) until it strikes the front of the chest,swung backward to the lateral plane (extension) and 20 to 30degrees back of the lateral plane (overextension). Movement ofthe arm downward toward the side from these positions is calledadduction or depression. The shoulder-joint also permits the armto describe a circle with the hand (circumduction), turn in or outon an axis passing lengthwise of the humerus (rotation), and withupward rotation of the scapula it can be carried up to a verticalposition. \ GLENOID DELTOID. SUPRASPI NATUS. TERES MAJOR. TERES MAJOR. HEADOF TRICEPS. Circumflex vessels.
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