Shoulder transverse flexion is a medial movement at the shoulder (glenohumeral) joint in a horizontal plane, resulting in a decrease of angle (flexion) – moving the upper arm towards and across the chest with the elbow facing out to the side – see Figure 1.
In anatomical terminology, a medial movement is one that moves part of the body closer to (medial to) the midline of the body.
Figure 1. Shoulder Transverse Flexion.
The key muscles involved in this movement are the sternal and clavicular heads of the pectoralis major, the anterior deltoid, and the coracobrachialis. The short head of the
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Golf Anatomy and Kinesiology, a collection of articles describing the roles of the muscles involved in the golf swing.
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» Golf swing instruction home page.