“…In affections of the nervous system, derangement of the bellows action is usually produced by impaired function of the respiratory muscles. This abnormality of ventilation, frequently called restrictive ventilatory dysfunction, has been defined as “an impairment of the ability to move air into and out of the lungs as a result of a defect in the thoracic bellows or pulmonary distensibility” (2). A nervous system lesion capable of producing an alteration in ventilation may be located at any one of various levels and yet produce similar manifestations.…”