Deep muscles of the thenar eminance

    Cards (2)

    • Adductor Pollicis (Deep):
      O: Two heads: oblique and transverse
      Oblique head: Tendon of FCR, base of 2nd, 3rd, 4th MCs, trapezoid and capitate
      Transverse head: Anterior surface 3rd MC shaft
      R: Laterally
      I: Both heads insert into medial side base proximal phalanx of thumb
      A: Thumb adduction and opposition
      NS: Deep branch ulnar nerve (C(7), 8, T1)
    • Opponens Pollicis (Deep): Deep to abductor pollicis brevis
      O: Flexor retinaculum and tubercle of trapezium
      R: Distally
      I: Lateral ½ anterior surface of 1st MC
      A: Opposition
      NS: Recurrent (lateral) branch median nerve (C5-8,T1)
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