[The reflex response in the abductor pollicis brevis muscle after tapping the distal segments of the fingers, the ulnar olecranon and scapular acromion. Electromyographic study].
The author made an electromyographic investigation of reflex responses in the abductor pollicis brevis muscle abductor pollicis brevis muscle after percussion with a hammer on the dorsal, lateral, palmar, medial and distal surface of the distal digit of the thumb, on the dorsal and palmar area of the distal digits of the other fingers and also on the olecranon ulnae and acromion scapulae. The investigation was made to detect the influence of the site of percussion on the character of the reflex response. The reflex responses were examined during slight isometric contraction of the muscle. After averaging rectification and of the recorded potentials the reflex responses were identified as excitatory and inhibitory modulation of the basal muscular activity depending on the inducing stimulus. Excitatory parts of the reflex response with a short latency were recorded after percussion on the lateral, dorsal and palmar area of the distal digit of the thumb and after percussion of the dorsal area of distal digits of the other fingers and after percussion of the palmar area of the little finger. As to other sites where reflexes were evoked first the inhibitory part of the reflex response was recorded. Excitation parts of reflex responses with a medium latency were obtained from all sites where reflexes were evoked. Late-latency parts of the reflex response had an inconstant occurrence. The results of the investigation provided evidence of a short-latency proprioceptory; influence of the abductor pollicis brevis muscle from synergic muscles.(ABSTRACT TRUNCATED AT 250 WORDS)
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D000328:Adult; D004550:Elbow; D004576:Electromyography; D005260:Female; D005385:Fingers; D006801:Humans; D007537:Isometric Contraction; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000502:physiology*; D012018:Reflex / Q000502:physiology*; D012782:Shoulder; D013933:Thumb
Reflexné odpovede v m. abductor pollicis brevis po poklepe na distálne clánky prstov ruky, olecranon ulnae a acromion scapulae. Elektromyografická stúdia.