Abductor Pollicis Brevis Under the Skin, Anterior View

The abductor pollicis brevis viewed from the front, depicting its crucial role in forming the thick, fleshy thenar eminence beneath the dermal layer.

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Description

Beneath the palmar skin, the abductor pollicis brevis forms the most superficial bulk of the thenar eminence on the radial side of the hand, lying anterior to opponens pollicis and lateral to flexor pollicis brevis. Its fibers run from the flexor retinaculum and scaphoid and trapezium tubercles toward the radial sesamoid and base of the proximal phalanx of the thumb, placing the muscle belly just superficial and slightly lateral to the first metacarpal. Distally, the APB tendon blends with the lateral portion of the extensor expansion and the capsule of the first metacarpophalangeal joint. Fine connective tissue septa tether the thenar fat pads to the dermis. Skin tension lines matter. This anterior, subdermal perspective is the one you want when teaching or planning around the recurrent motor branch of the median nerve as it curves into the thenar muscles, because even small variations in its course can turn a routine carpal tunnel release into a motor deficit with loss of palmar thumb abduction. The view also supports bedside localization: weakness of APB on resisted thumb abduction perpendicular to the palm, paired with thenar hollowing, points strongly to median neuropathy rather than ulnar or radial nerve pathology. If the illustration also highlights the abductor pollicis longus tendon more proximally, it helps separate thenar motor loss from radial-sided wrist pain syndromes such as de Quervain tenosynovitis, where the APL runs through the first dorsal compartment. Use this artwork in gross anatomy and upper-limb dissection courses to anchor the layered organization of the thenar compartment, or in hand surgery texts and patient education materials discussing carpal tunnel syndrome, opponensplasty planning, and thenar muscle wasting patterns. It also fits occupational therapy and hand rehabilitation manuals that need a clear surface-to-deep map for splint design and targeted strengthening. Anatomical accuracy verified by SciePro's Medical Advisory Board.