Shoulder flexion is a bending at the shoulder (glenohumeral) joint, resulting in a decrease of angle (flexion) – moving the upper arm upwards to the front – see Figure 1.
Figure 1. Shoulder Flexion.
The key muscles involved in this movement are the anterior and lateral deltoid, the clavicular head of the pectoralis major, and the coracobrachialis. The short head of the biceps brachii also plays a role.
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