摘要
本文在12个健康男性青年的旋前方肌、旋前圆肌、旋后肌、肱二头肌及肱桡肌,以Ediswan脑电墨水描记仪,用肌内电极引出电位进行分析,结果认为:旋前方肌无论在肘的伸位或屈位,当前臂慢旋前时,它的电位都比旋前圆肌更活动。给以抵抗力时二肌电位活动都增加。旋后肌在肘伸位前臂慢旋后时,即出现了电位活动,但肱二头肌无活动只是给以抵抗力时始出现电位活动。肘屈位,前臂从旋前位旋后时,旋后肌首先出现电位活动。肱二头肌自中间位到完全旋后位电位活动逐渐增加,而旋后肌则逐减小。肱桡肌使旋前位或旋后位的前臂迴旋到中间位的作用,只是在肘屈位特别自旋前位旋后至中间位的电位较明显。
The electromyographies were made on 12 healthy young adult males to investigate the function of supinators and pronators in the extended and flexed elbows during pro-nation and supination.The potentials were picked up with the needle electrode from the pronator teres,pronator quadratus,the supinator,the biceps brachialis and the bra-chioradialis.The study revealed the following facts:1.During slow pronation,regardless whether the elbow was flexed or extended,the potentials from the pronator quadratus were always more active than that from the pronator teres.The former showed the activities from“marked”to“most marked”and the latter from“slight”to“moderate”.When the pronation was resisted,the activities increased in both muscles.2.During slow supination,both pronators showed activities of various degree as antagonistic muscles.During slow supination in the extended elbow,the potentials ap-peared in the supinator alone,but no activities were seen in the biceps unless the supina-tion was resisted.The biceps was,therefore,not proved to be a supinator when the elbow was in an extending position.When the flexed elbow was supinated from a prone position,the activities were recorded from the supinator immediately but none from the biceps at first.When the forearm reached an intermediate position,it began to show“slight”activity whereas the supinator showed“marked”.When the forearm moved to-ward full supination the activities of the supinator decreased gradually,reaching“no activity”at the end,but the activities of the biceps increased gradually.It was proved that the supinator was a primary supinator and the biceps a reinforcer.3.The brachioradialis is usually described as a pronator when the forearm is in supine position and a supinator in prone position.This present study showed it was neither a pronator nor a supinator in the extended forearm,and it was only so when supinating a flexed forearm from a prone to semiprone position.In the further course of supination the activities were not increased at all.Thus the brachioradialis could be considered as an axillary supinator from prone to semiprone position.
作者
张殿明
刘汉绅(指导)
CHANG TIAN-MING(Department of Anatomy,Tientsin Medical College)
出处
《解剖学报》
CAS
1963年第3期267-272,共6页
Acta Anatomica Sinica
作者简介
刘汉绅,天津医学院生理教研组副教授
