• Acta neurochirurgica · Jul 2006

    Case Reports

    Segmental overlap: foot drop in S1 radiculopathy.

    • N C Voermans, A C Koetsveld, and M J Zwarts.
    • Neuromuscular Centre Nijmegen, Department of Neurology, Radboud University Nijmegen Medical Centre, The Netherlands. n.voermans@neuro.umcn.nl
    • Acta Neurochir (Wien). 2006 Jul 1; 148 (7): 809-13; discussion 813.

    AbstractKnowledge of segmental innervation of skeletal muscles is essential for diagnosing lumbar radiculopathy. Myotomes and dermatomes are traditionally thought to be innervated by a single spinal segment, but experimental studies have shown that this pattern of segmental innervation allows considerable overlap. This implies that muscles (or dermatomes) are innervated not only by axons of one spinal segment, but also partially by axons of adjacent spinal levels. We describe a patient in whom overlap in segmental innervation complicated adequate diagnosis of a recurrent lumbar hernia. Further, we present an outline of electrophysiological and anatomical studies on segmental innervation.

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