The Abductor Pollicis Brevis is a small muscle located in the hand, specifically in the palm. It is part of the group of muscles known as the intrinsic muscles, which help control fine movements of the fingers. This muscle is responsible for the abduction of the thumb, allowing it to move away from the palm, which is essential for grasping and pinching objects. The muscle originates from the scaphoid and trapezium bones of the wrist and inserts into the base of the proximal phalanx of the thumb. It is innervated by the median nerve, which plays a crucial role in hand function. Proper functioning of the Abductor Pollicis Brevis is vital for activities that require thumb mobility.