Medial 2 (bipennate) Lumbricals

• O (origin):

  • Adjacent sides of flexor digitorum profundus tendons on digits 3, 4 and 5

  A) Medial 2 Lumbricals

  
• I (insertion):

  • Lateral edge of dorsal digital expansions at base of proximal phalanx

  A) Medial 2 Lumbricals

  
• A (actions):

  • Flexion of metacarpophalangeal joints
  • Extension of interphalangeal joints

  A) Medial 2 Lumbricals

  
• NS (nerve supply):

  • Deep branch ulnar nerve (C7 - T1)

  A) Medial 2 Lumbricals

  
• The medial 2 lumbricals are bipennate