Muscles of the Lower Hand Under the Skin

Description

Palmar soft tissues are rendered in anterior view with the skin removed, centering on the thenar eminence (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) on the radial side and the hypothenar group (abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi) on the ulnar side. Between these muscular pads, the palmar aponeurosis spans distally toward the digital slips, superficial to the flexor tendons as they course into the fibrous digital sheaths. Proximal structures from the antebrachium logically continue into the carpal region, including the flexor digitorum superficialis and profundus tendons and the flexor pollicis longus tendon, with the median nerve tracking centrally and the ulnar neurovascular bundle positioned more ulnarly toward Guyon’s canal. Bones of the metacarpals and phalanges provide the deep scaffold. A tight space. This palmar arrangement is the teaching map for compressive and traction neuropathies at the wrist and palm. The median nerve relationship to the flexor tendons under the flexor retinaculum explains why carpal tunnel syndrome presents with thenar weakness and sensory change in the radial three and a half digits, while ulnar nerve compromise at Guyon’s canal can spare dorsal ulnar hand sensation yet weaken hypothenar function and the ulnar two lumbricals. Tendon course and pulley confinement also matter in trigger finger and in planning A1 pulley release without violating the digital neurovascular bundles. Use this artwork for hand anatomy labs, orthopaedic or plastic surgery teaching files, and textbook figures that need a clean separation of thenar and hypothenar compartments with clinically faithful tendon and nerve trajectories from the distal forearm into the palm. Anatomical accuracy verified by SciePro's Medical Advisory Board.