Jakobson-Lask phenomenon and his diagnostic value in neurologic practice
At 220 healthy faces of different age and at 205 patients with dyscirculatory encephalopathy (90 persons, 20-73 years old), Parkinson's disease (50 persons, 39-84 years old) and a multiple sclerosis (65 persons, 20-65 years old) have been studied separately all components wrist-beam and Jakobson-Lask of reflexes and degree of their associativity to such signs pyramidal insufficiency, as a hyperreflection and hands pathological phenomena. It is established, that frequencies of registration bending reactions of fingers at calling of a reflex at healthy and illness man are comparable, but at patients with pyramidal pathology dominated (67%) high and average degree of expressiveness of the reflex answer which in clinical practice is presented as a hyperreflection. Frequent detectability bending of fingers at calling carp-radial reflexes at healthy faces (47%), including in some cases and high degree of expressiveness, does not allow to interpret such reaction of fingers (Jakobson-Lask reflex) as pathological hands reflex. Besides, at healthy faces the reflex in 51,9% of supervision either did not come to light, or had unicomponent character, and at illness man dominated (87,5%) two- and three-componental reflex reaction. As indirect acknowledgement to that Jakobson-Lask bright symptom is hyperreflection display, instead of pathological hands reflex considerable frequency bending serves reaction of fingers, along with increase miotatic reflexes, at minimum occurrence (14%) hands pathological signs at Parkinson's disease. Ease of transformation of a physiological wrist-beam reflex in a pathological symptom (hyperreflection) is seen in initial biological mission of a hand - to carry of seizing function.