Extensor expansion

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Extensor expansion
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Extensor expansion covers the tendon of extensor digitorum tendons over the proximal phalanges
TA2 2502
Anatomical terminology

An extensor expansion (extensor hood, [1] dorsal expansion, dorsal hood, dorsal aponeurosis[ citation needed ]) is the special connective attachments by which the extensor tendons insert into the phalanges.

Contents

These flattened tendons (aponeurosis) of extensor muscles span the proximal and middle phalanges. [2]

At the distal end of the metacarpal, the extensor tendon will expand to form a hood, which covers the back and sides of the head of the metacarpal and the proximal phalanx.

Bands

The expansion soon divides into three bands:

Function

The extensor expansion allows for contractile forces from the extensor compartment muscles to be transferred to the phalanges. It also balances the forces across the phalanges. [1]

References

  1. 1 2 Blankenbaker, Donna G.; Davis, Kirkland W.; Sonin, Andrew; Crim, Julia R., eds. (2016-01-01), "Extensor Tendon Injury, Wrist and Fingers" , Diagnostic Imaging: Musculoskeletal Trauma (Second Edition), Diagnostic Imaging, Elsevier, pp. 468–473, doi:10.1016/b978-0-323-39253-2.50118-x, ISBN   978-0-323-39253-2 , retrieved 2021-01-04
  2. "eMedicine - Hand, Tendon Lacerations: Extensors : Article by D Glynn Bolitho, MD, PhD, FACS" . Retrieved 2008-01-20.[ failed verification ]
  3. Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstown, MD: Lippincott Williams & Wilkins. p. 43. ISBN   0-7817-5309-0.