MYOGRAPH

n. Mi'o-gra3f. Lat., myograph i on, myographium (from MUS, a muscle, and ypa^eiv, to write). Fr., myoyraphe. Ger., Muskelbeschreiber. An apparatus for recording graphically the curve of a muscular contraction. [K.] Cardiac m. Fr., myographe du coeur. See CARDIOGRAPH. Comparative m., Double m. A m. to be used with two different muscles simultaneously. [L, 87 (a, 46).] Fall-in. A m. devised by Harle in which the contraction is registered upon a falling plate. [Landois (K).] Palate m. A m. for recording the movements of the uvula during deglutition, phonation, etc. It consists e entially of a delicate rod one end of which is introduced through the nose and placed against the soft palate, while the other rests " upon a revolving drum. [H. Allen. Trans, of the Coll. of Surgeons of Phila.," vi. 1884 (K).] Pendulum m. Ger., PendelMyographium. A m. having a seconds pendulum so arranged that at each half-revolution it discharges an electric current through the nerve of a nerve-muscle preparation. [K, 3.] Spring m. [Du Bois-Reymond]. Ger., Feder-M. An instrument for recording graphically the time which elapses between the irritation of the nerve supplying a muscle and the contraction of that muscle. -- Thickne m. A m. that records graphically the variations of the thickne of a muscle as it contracts or relaxes, [a, 48.] [s. 57]