Vasomotor

(va' -zo-mo' -tor). Pertaining to the motility of the non-striped muscles of the arterial system; regulating the tension of a blood-ve el; vasoconstrictor. V. Ataxia, a condition of instability of the circulatory mechanism, described Solis-Cohen and characterized by abnormal readine of disturbance of the equilibrium of the cardio-vascular apparatus, with tardine of restoration. In some cases the.phenomena are of paretic, in others of spasmodic character. Usually the two kinds of phenomena are displayed in varying degree in the same patient. Dermographism is an e ential feature and in most cases factitious urticaria can be induced; mottlings of the skin, peculiar markings of the nails, telangiectases and stigmata are common. There is usually a hemorrhagic tendency. In some cases the thyreoid gland has been altered. The action of the heart is usually rapid, irregular, and easily disturbed; palpitation is common, and intermittent tachycardia has been noticed; nemic and functional murmurs are not uncommon. V. Bronchitis. See Asthma . V. Center. See Center . Subordinate centers are distributed throughout the spinal axis. V. Nerves, the nerves pa ing to the blood-ve els; stimulation causing contraction, narrowing of the lumen, and consequent increase of blood-pre ure. Paralysis of the center produces the opposite effects. V. Rhinitis. See Hay-fever.