Deep group of anterior forearm

  1. Flexor digitorum profundus
  2. Flexor pollicis longus
  3. Pronator quadratus
Muscle Action Origin Insertion Innervation
Flexor digitorum profundus Flexion at DIPJ of fingers 2-5; flexion at MCPJ ulnar and interosseus membrane four tendons that insert into palmar surfaces of the distal phalanges Medial 1/2 = ulnar nerve; lateral 1/2 = median nerve
Flexor pollicis longus Flexion of interphalangeal +/- MCP joint of thumb Anterior surface of radius and radial half of interosseous membrane Base of distal phalanx of thumb Anterior interosseous nerve, br. median nerve
Pronator quadratus pronation distal anterior surface of ulna distal anterior surface of ulna Anterior interosseous nerve, br. median nerve

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