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Direction of Pull of the Lateral Crico-Arytenoids, which adduct the Vocal Cords. In whispering, the larynx takes scarcely any part in the production of the sounds; the vocal cords remain apart and comparatively slack, and the expiratory blast rushes through without setting them in vibration. In stammering, spasmodic contraction of the diaphragm interrupts the effort of expiration.
The adductor longus may be ruptured, or torn from the pubes, by a violent effort to adduct the limb. A swelling forms in the upper and medial part of the thigh, which becomes smaller and harder when the muscle is thrown into contraction. The quadriceps femoris is usually ruptured close to its insertion into the patella, in the attempt to avoid falling backwards. The injury is sometimes bilateral.
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