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Flexor and Extensor Mechanisms of Hand
Julia R. Crim, MD
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TERMINOLOGY

  • Definitions

    • This chapter discusses digits 2-5; thumb musculature is discussed in the "Thumb Anatomy" chapter

EXTRINSIC FLEXOR MUSCULATURE: DIGITS 2-5

  • Flexor Digitorum Superficialis (FDS)

    • Flexor Digitorum Profundus (FDP)

      • Vinculum Breve and Longum

        FLEXOR PULLEYS: DIGITS 2-5

        • Critical Stabilizers of Flexor Mechanism

          • Annular Pulleys

            • Cruciform Pulleys

              • Pulley System 1st Digit

                Flexor Tendon Sheaths: Digits 2-5

                • Common Flexor Tendon Sheath

                  • Digital Flexor Tendon Sheaths (Digits 2-4)

                    EXTENSOR MECHANISM: DIGITS 2-5

                    • Extensor Digitorum Communis (EDC)

                      • Extensor Indicis (EI)

                        • Extensor Digiti Minimi (EDM)

                          • Lateral Bands/Conjoined Tendons

                            • Extensor Hood

                              INTRINSIC FLEXORS AND EXTENSORS: DIGITS 2-5

                              • Lumbricals

                                • Dorsal Interossei

                                  • Palmar Interosseous Muscles

                                    • Hypothenar Muscles: Opponens Digiti Minimi, Abductor Digiti Minimi, and Flexor Digiti Minimi

                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      TERMINOLOGY

                                      • Definitions

                                        • This chapter discusses digits 2-5; thumb musculature is discussed in the "Thumb Anatomy" chapter

                                      EXTRINSIC FLEXOR MUSCULATURE: DIGITS 2-5

                                      • Flexor Digitorum Superficialis (FDS)

                                        • Flexor Digitorum Profundus (FDP)

                                          • Vinculum Breve and Longum

                                            FLEXOR PULLEYS: DIGITS 2-5

                                            • Critical Stabilizers of Flexor Mechanism

                                              • Annular Pulleys

                                                • Cruciform Pulleys

                                                  • Pulley System 1st Digit

                                                    Flexor Tendon Sheaths: Digits 2-5

                                                    • Common Flexor Tendon Sheath

                                                      • Digital Flexor Tendon Sheaths (Digits 2-4)

                                                        EXTENSOR MECHANISM: DIGITS 2-5

                                                        • Extensor Digitorum Communis (EDC)

                                                          • Extensor Indicis (EI)

                                                            • Extensor Digiti Minimi (EDM)

                                                              • Lateral Bands/Conjoined Tendons

                                                                • Extensor Hood

                                                                  INTRINSIC FLEXORS AND EXTENSORS: DIGITS 2-5

                                                                  • Lumbricals

                                                                    • Dorsal Interossei

                                                                      • Palmar Interosseous Muscles

                                                                        • Hypothenar Muscles: Opponens Digiti Minimi, Abductor Digiti Minimi, and Flexor Digiti Minimi