phenomenon

(fe-nom’en-on) [L. phenom'enon; Gr. φαινόμενον thing seen]. Any remarkable appearance; any sign or objective symptom. arm p. Same as Pool’s ῥ. (second def.). p. of Arthus, the subcutaneous ti ues of the rabbit can, by repeated injections of horse serum, be sensitized and thus made to react so as to cause their destruction, the rest of the body meanwhile showing no increase of sensitivene . Aubert’s p., by an optic illusion, when the head is turned toward one side a vertical line appears to incline toward the other side. Babinski’s p., extension and spreading in place of flexion of the toes when the sole is excited: it is characteristic of hemiplegia due to a lesion in the pyramidal tract, or of the anterolateral portions of the spinal cord. Babinski’s combined flexion p. See Babinshi’s sign (4), under sign. Becker's p., pulsation of the retinal arteries in exophthalmic goiter. Bell's Ῥ., an outward and upward rolling of the eyeball on the attempt to close the eye: it occurs on the affected side in peripheral facial (Bell's) paralysis. Bordet’s p. Sce serum-test, under test. Bordet- Gengou p. Sce fixation of complement. chams pleon p., the a umption of a green color by a potato-culture of Bacillus pyocyaneus at the point where touched by a platinum wire. Collie p., when pure neon is inclosed in a gla tube with a globule of mercury and shaken, it glows with a bright, or angered color, and when the globule rolls it appears to be followed by a flame. Danysz’s p., decrease of the neutralizing influence of an antitoxin when a toxin is added to it in divided portions instead of all at once. Deny-Leclef p., phagocytosis taking PHENOMENON lace in a test-tube on mixing therein leukocytes, acteria, and their immune serum. diap) - matic p., the movement of the diaphragm as seen through the walls of the body; its variations have a certain diagnostic value. Duck worth’s p., arrest of breathing before stoppage of the heart's action in certain fatal brain affections. Eisenberg’s p., with increasing concentration of the agglutinins added to a bacterial emulsion the absolute absorption of by the bacteria rises, while the coefficient of absorption falls. Erben’s p., temporary slowne of the pulse on stooping or sitting down: said to characterize certain cases of neuras-. thenia. face-p., facia’lis p. Same as Chrostek’s sign, under sign. finger p. See Sougue's p. Fried rich’s p., the percu ion sound over a cavity in the lung is raised on deep inspiration. Gala i’s pupillary Ῥ. Same as Westphal- Piltz p. Gurtner’s p., the degree of fulne of the veins of the arm as it is raised to varying heights indicates the degree of pre ure in the right auricle. Gra et’s p., Gra et-Grau el p., inability of a patient to raise both legs at the same time, though he can do either separately. Hapke’'s p., unusually prominent presentation of the parietal bone of the head of the first one of twins. Hata p., increase in severity of an infectious disease when a small dose of a chemotherapeutic remedy is given. Hering’s p., a faint murmur heard with the stethoscope over the lower end of the sternum for a short time after death. hip-p., Joffroy’s reflex. See under γεῆεχ. Hochsinger’s p., pre ure on the inner side of the biceps muscle produces closure of the fist in tetany. jawing p., raising of the upper eyelid when the jaw is pre ed downward, and slight ptosis when the mouth is closed. Koch's p., the sudden collapse of tuberculous animals when a fresh culture of tubercle bacilli is injected within the peritoneum. The exudate that forms contains lymphocytes almost exclusively. Kiihne’s muscular p. Same as Porrel's f; leg-p. See Schlesinger’s sign, under sign. Litten’s diaphragm-p., a movable horizontal depre ion on the lower part of the sides of the thorax, seen in respiration. Lust’s p., abduction with dorsal flexion of the foot on tapping the external popliteal nerve just below the head of the fibula: indicative of spas mop hili a. -Reincke p., the mortality from all diseases decreases as a result of water purification. Nasaroff’s p., gradual decrease in the difference between the rectal temperature before and after the bath, seen after repeated cold baths. Nei er- Doering p., suppre ion of the normal hemolytic action of human serum due to the presence of some anti hemolytic substance: sometimes seen in renal cirrhosis and arteriosclerosis. Nei er-Wechsberg p., a certain amount of immune body and complement, when brought in contact with a given amount of bacterial culture, will cause death of all the bacteria; if, however, a greater amount of immune body is used, the complement and culture remaining the same, the bacteria are not harmed. orbic Ῥ. Same as W'estphal- Piltz p. Osler's p., agglutination of the platelets of blood directly after it is withdrawn from the circulation. pa plantar p., a yellowish discoloration of parts of the palms and soles in typhoid fever; Filipovicz's sign. paradoxical Ῥ p. Same as Litten’s diaphragm p. paradoxical pupil p. Same as Westphal-Pilts be peroneal-nerve p. Same as Lust's p. eiffer’s p., the clumping of bacilli, as in Widal’s test. phrenic p., rhythmic spasm of the left half of the diaphragm: seen in tetanus. Pool’s Ῥ. 1. Same as Schlesinger’s sign, under sign. 2. Contraction of the muscles of che arm following the raising of the arm above the head with the forearm extended, so as to cause stretching of the brachial plexus: seen in postoperative tetany. Porret’s P-s the pa age of a continuous current through a living muscle-fiber causes an undulation proceeding from the positive toward the negative pole. Purkinje’s p., the phenomenon that fields of equal brightne but different color become unequally bright if the intensity of the illumination is decreased. Ritter-Rollet p., flexion of the foot upon gentle electric stimulation, and its extension upon energetic stimulation. Rumpel- Leede p., the appearance of minute subcutaneous hemorrhages below the area at which a rubber bandage is applied not too tightly for ten minutes upon the upper arm: characteristic of scarlet fever. Schiiller’s p., in functional hemiplegia the patient in walking turns to the healthy side, but to the diseased side in organic hemiplegia. Souque’s p., a phenomenon seen in incomplete hemiplegia, consisting of involuntary extension and separation of the fingers when the arm is raised. Called also Singer p. staircase p., succe ive increase in the contractions of a muscle repeatedly stimulated with stimuli of equal intensity. Stra mann’s p., phenomena seen in the umbilical cord of the still attached placenta. When the umbilical cord is ligated, the umbilical arteries contract and the umbilical vein remains filled with blood. The slightest tapping upon the fundus uteri will be felt at the lower end of the umbilical cord, and if pre ure is applied to the fundus uteri, the umbilical vein becomes distended with blood at its extremity. Striimpell p., involuntary flexion of the ankle on flexing the hip and knee. Theobald Smith p., although a small dose of foreign serum may be borne by an animal without serious effects, a repetition of the injection after an interval of ten days or more is followed by profound and often fatal intoxication: anaphylaxis. toe-p., extension of the toes on stimulation of the sole of the foot: seen in certain morbid conditions. Traube’s p., a double diastolic and systolic murmur heard at the femoral and other peripheral arteries, as in aortic insufficiency, and sometimes in mitral stenosis. Trou eau’s p., spasmodic contractions of muscles provoked by pre ure upon the nerves which go to them: seen in rickets, etc. Westphal-Piltz p., contraction of the pupil, followed by dilatation, after vigorous closing of the lids; caused by tension of the orbicularis muscle.