list of flexors of the human body list of flexors of the human body a flexor is a muscle that flexes a joint. 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. for example, one’s elbow joint flexes when one brings their hand closer to the shoulder. flexion is typically instigated by muscle contraction of a flexor. part of a series of lists abouthuman anatomy general features regions variations movements systems structures arteries bones eponymous foramina glands endocrine lymphatic vessels nerves organs systems veins muscles abductors adductors depressors elevators extensors flexors rotators external internal