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Related Experiment Videos

Posterior interosseous nerve terminal branches.

H Elgafy1, N A Ebraheim, A T Rezcallah

  • 1Department of Orthopaedic Surgery, Medical College of Ohio, Toledo 43614-5807, USA.

Clinical Orthopaedics and Related Research
|July 25, 2000
PubMed
Summary

This study maps the six terminal branches of the posterior interosseous nerve in 30 upper limbs. It details their precise anatomical locations and muscle targets to guide surgeons and prevent nerve damage.

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Area of Science:

  • Anatomy
  • Neuroscience
  • Surgical Anatomy

Background:

  • The posterior interosseous nerve (PIN) is crucial for forearm extensor muscle function.
  • Understanding the branching patterns of the PIN is vital for surgical procedures in the posterior forearm.

Purpose of the Study:

  • To delineate the common branching pattern of the terminal branches of the posterior interosseous nerve.
  • To provide precise anatomical landmarks for identifying these branches and minimizing iatrogenic injury.

Main Methods:

  • Dissection of 30 embalmed cadaveric upper limbs.
  • Detailed mapping of the origin, course, and distribution of the PIN terminal branches.

Main Results:

  • The PIN branches formed a common leash 0.43 cm distal to the supinator and 8 cm from the lateral epicondyle.

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  • Six distinct branches were identified, supplying various extensor muscles including extensor digitorum communis, extensor carpi ulnaris, extensor digiti minimi, extensor pollicis longus, extensor pollicis brevis, and abductor pollicis longus.
  • Specific distances from anatomical landmarks (lateral epicondyle, Lister's tubercle) were recorded for key branching points.

    • Conclusions:

    • A consistent pattern of six terminal branches of the posterior interosseous nerve was identified.
    • The study provides a detailed anatomical guide for surgeons to safely identify and preserve these branches during procedures.
    • Knowledge of these branching patterns aids in preventing iatrogenic nerve injury and improving surgical outcomes.