Shoulder transverse abduction is a lateral movement at the shoulder (glenohumeral) joint in a horizontal plane – moving the upper arm away from the chest with the elbow facing down – see Figure 1.
In anatomical terminology, a lateral movement is one that moves part of the body further from (lateral to) the midline of the body.
Figure 1. Shoulder Transverse Abduction.
The key muscles involved in this movement are the posterior and lateral deltoid. The infraspinatus and teres minor also play a weak role.
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» Golf swing instruction home page.