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Flexion is a term used in anatomical terminology that refers to a movement that decreases the angle between two bones at a joint. For example, your elbow joint flexes when you bring your hand closer to the shoulder. Flexion is typically instigated by muscle contraction. A muscle that flexes a joint is called a flexor. In anatomy, flexion (from the Latin verb flectere, to bend) is a joint movement that decreases the angle between the bones that converge at the joint.
The hip flexors are (in descending order of importance to the action of flexing the hip joint):