When the arm abducts 180 degrees relative to the trunk,how many degrees of this motion occur at the scapulocostal joint?

Question

Quizplus · Accepted Answer

60 degrees of the 180-degree abduction of the arm occur at the scapulocostal (scapulothoracic) joint. This is part of the scapulohumeral rhythm, where for every 2 degrees of motion at the glenohumeral joint, there is 1 degree of motion at the scapulocostal joint.

When the Arm Abducts 180 Degrees Relative to the Trunk,how