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Delayed Finger Opening Caused by a Midbrain Lesion Yukinobu Saito 1 , Yoshiaki Wada 1 , Takahiro Nakayama 1 , Tetsuo Furukawa 1 , Hiroshi Tsukagoshi 1 1Department of Neurology, Tokyo Medical and Dental University Keyword: delayed finger opening , midbrain lesion , Weber's syndrome , hesitation of finger opening pp.1157-1161
Published Date 1991/12/1
DOI https://doi.org/10.11477/mf.1406900286
  • Abstract
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We report a 25 year-old woman with delayed finger opening caused by a midbrain lesion. Mag-netic resonance imaging revealed an abnormal intensity area in the left midbrain in the vascular teritory corresponding to the mesencephalic infero-median branch and central posteromedian branch of posterior cerebral artery.

Clinically, she suffered from Weber's syndrome, and in the course of recovery, she developed marked delayed finger opening. Her weakness was slight, this delayed finger opening was observed only after maximal grip, and she required about ten seconds to open her right fingers. She could open and grip her fingers easily and quickly in moderate contraction. In the electromyogram, the action potentials of flexor digitorum profundus muscle did not disappear promptly upon instruction to open her fingers, and they lasted for approximately six secons with grad-ual decrease. On the other hand, the action poten-tials of extensor digitorum muscle were reciprocally inhibited and increased gradually after the decrease of the flexor muscle potentials. The abnormally continuing discharges in the flexor muscles were thought to be the cause of her delayed finger open-ing.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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