Measurement of cross-sectional area of cervical roots and brachial plexus trunks

Sun Jae Won, Byung Jo Kim, Kyung Seok Park, Se Hwa Kim, Joon Shik Yoon

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


Introduction: The aim of this study was to determine normal reference values for cross-sectional area (CSA) and the correlation between demographic factors and CSA in the cervical roots and brachial plexus trunks using ultrasonography. Methods: Ninety-five age-matched healthy individuals were studied. Ultrasonographic tests were performed via nerve tracing from the cervical root to the brachial plexus trunk. The CSA of each nerve was measured in the C5-8 ventral roots and brachial plexus (trunk level). Results: Normal values of each cervical root were: C5, 5.66 ± 1.02 mm2; C6, 8.98 ± 1.65 mm2; C7, 10.43 ± 1.86 mm2; and C8, 10.76 ± 2.02 mm2. Values for the brachial plexus were: upper trunk, 16.70 ± 2.88 mm2; middle trunk, 14.01 ± 2.70 mm2; and lower trunk, 13.75 ± 2.57 mm2. The side-to-side discrepancy was 11.91 ± 11.11%. Body mass index (BMI) and height correlated frequently with nerve CSA. Conclusions: These reference values may be helpful in investigating pathologies involving the cervical area.

Original languageEnglish
Pages (from-to)711-716
Number of pages6
JournalMuscle and Nerve
Issue number5
Publication statusPublished - 2012 Nov
Externally publishedYes


  • Brachial plexus
  • Cervical root
  • Nerve cross-sectional area
  • Normal values
  • Ultrasonography

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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