Büll M L, de Freitas V, Vitti M
Department of Anatomy, UNESP, Botucatu, Brasil.
Anat Anz. 1990;171(2):125-33.
The emg activity of the trapezius (pars superior) and serratus anterior (pars inferior) mm. in free movements of the arm was examined in 25 young adult volunteers of both sexes, using a 2-channel TECA TE4 electromyograph with single coaxial needle electrodes. The records obtained showed that: 1) In abduction, flexion, adduction and extension of the arm, TS and SI act synergically; 2) The activity of both muscles increases gradually in abduction and flexion when the scapular rotation occurs. TS also acts as scapular elevator, a movement which occurs simultaneously with abduction and flexion; 3) The activity of both muscles decreases gradually in adduction and extension which controls the return of the scapula and clavicle to the initial position; 4) In hyperextension TS and SI are inactive.
使用带有单根同轴针电极的双通道TECA TE4肌电图仪，对25名年轻成年男女志愿者手臂自由运动时斜方肌（上部）和前锯肌（下部）的肌电图活动进行了检查。获得的记录显示：1）在手臂外展、屈曲、内收和伸展时，斜方肌上部（TS）和前锯肌下部（SI）协同作用；2）当发生肩胛骨旋转时，在手臂外展和屈曲过程中，两块肌肉的活动逐渐增加。斜方肌上部还起到肩胛骨上提肌的作用，该运动与外展和屈曲同时发生；3）在控制肩胛骨和锁骨回到初始位置的内收和伸展过程中，两块肌肉的活动逐渐减少；4）在过伸时，斜方肌上部和前锯肌下部不活动。
