Abductor Pollicis Brevis - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The abductor pollicis brevis is a thenar muscle located within the hand. It forms the anterolateral aspect of the thenar eminence, overlying the opponens pollicis. Attachments: Originates from the tubercles of the scaphoid and trapezium and from the associated flexor retinaculum. Attaches to lateral aspect of the proximal phalanx of the thumb. Actions: Abduction of the thumb. Innervation: Median nerve (recurrent branch) Blood supply: Superficial palmar arch By TeachMeSeries Ltd (2026) Figure 1Palmar view of the thenar muscles. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the abductor pollicis brevis? The abductor pollicis brevis is a muscle in the hand that is part of the thenar group. It is situated on the anterolateral side of the thenar eminence and plays a crucial role in thumb movement. What are the attachments of the abductor pollicis brevis? This muscle originates from the tubercles of the scaphoid and trapezium bones, as well as the flexor retinaculum. It inserts on the lateral side of the proximal phalanx of the thumb. What is the primary action of the abductor pollicis brevis? The main action of the abductor pollicis brevis is to facilitate the abduction of the thumb. This movement is essential for grasping and pinching activities. Which nerve innervates the abductor pollicis brevis? The abductor pollicis brevis is innervated by the recurrent branch of the median nerve. This nerve supply is vital for the muscle's function in thumb mobility. What is the blood supply to the abductor pollicis brevis? The blood supply to the abductor pollicis brevis comes from the superficial palmar arch. This vascular support is important for maintaining the muscle's health and functionality. Rate This Article