A adductor muscle is any muscle that causes adduction. It may refer to: Humans Adductor muscles of the hip, the most common reference in humans, but may also refer to Adductor brevis muscle, a muscle in the thigh situated immediately behind the pectineus and adductor longus Adductor hallucis muscle, a muscle responsible for adducting the big toe Adductor longus muscle, a skeletal muscle located in the thigh Adductor magnus on the medial side of the thigh Adductor minimus muscle, a small and flat skeletal muscle in the thigh Adductor pollicis muscle, a muscle in the hand that functions to adduct the thumb Other animals Adductor muscles (bivalve), a muscle in the interior of a bivalve mollusk which close the valves The large foot-to-shell muscle in gastropods such as the abalone and limpet