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Thumb Anatomy
Julia R. Crim, MD
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TERMINOLOGY

  • Definitions

    • Abduction: Movement away from 2nd digit
    • Adduction: Movement toward 2nd digit
    • Opposition: Thumb comes in contact with other fingers; combination of flexion and abduction
    • Reposition: Return from opposition to anatomic position

GROSS ANATOMY

  • Features Distinguishing Thumb From Other Digits

    • 1st Carpometacarpal Joint

      • 1st Metacarpophalangeal Joint: Hinge Joint

        • 1st Interphalangeal Joint

          • Intrinsic Thenar Muscles

            • Other Intrinsic Muscles

              • Extrinsic Muscles

                • Flexor Pulleys

                  Related Anatomy
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                  Related Differential Diagnoses
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                  References
                  Tables

                  Tables

                  TERMINOLOGY

                  • Definitions

                    • Abduction: Movement away from 2nd digit
                    • Adduction: Movement toward 2nd digit
                    • Opposition: Thumb comes in contact with other fingers; combination of flexion and abduction
                    • Reposition: Return from opposition to anatomic position

                  GROSS ANATOMY

                  • Features Distinguishing Thumb From Other Digits

                    • 1st Carpometacarpal Joint

                      • 1st Metacarpophalangeal Joint: Hinge Joint

                        • 1st Interphalangeal Joint

                          • Intrinsic Thenar Muscles

                            • Other Intrinsic Muscles

                              • Extrinsic Muscles

                                • Flexor Pulleys