J Reconstr Microsurg 2005; 21(1): 57-70
DOI: 10.1055/s-2005-862783
Copyright © 2005 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA.

Contribution of the Distal Nerve Sheath to Nerve and Muscle Preservation Following Denervation and Sensory Protection

Karen Veltri1 , Jacek M. Kwiecien2 , Wyatt Minet3 , Margaret Fahnestock4 , James R. Bain5
  • 1Department of Medical Sciences, Division of Behavioral Neurosciences
  • 2Department of Pathology and Molecular Medicine, Central Animal Facility
  • 3Faculty of Medicine, Division of Plastic Surgery, McMaster University, Hamilton, Ontario, Canada
  • 4Department of Psychiatry and Behavioral Neurosciences, Division of Plastic Surgery, McMaster University, Hamilton, Ontario, Canada
  • 5Department of Surgery, Division of Plastic Surgery, McMaster University, Hamilton, Ontario, Canada
Further Information

Publication History

Publication Date:
26 January 2005 (online)

ABSTRACT

The goal of this study was to determine the contribution of the distal nerve sheath to sensory protection. Following tibial nerve transection, rats were assigned to one of the following groups: (1) saphenous-to-tibial nerve neurorrhaphy; (2) saphenous-to-gastrocnemius neurotization; (3) unprotected controls (tibial nerve transection); or (4) immediate common peroneal-to-tibial nerve neurorrhaphy. After a 6-month denervation period and motor reinnervation, ultrastructural, histologic, and morphometric analyses were performed on the distal tibial nerve and gastrocnemius muscle cross-sections. Sensory axons neurotized to muscle maintain existing muscle integrity, as demonstrated by less fibrosis, collagenization, and fat deposition, more than unprotected muscle, and preserve the distribution pattern of fast twitch fibers. However, neurorrhaphy of the sensory nerve to the distal tibial nerve (involving the distal nerve sheath) improves existing endoneurial sheath structure, demonstrated by reduced collagen, and enhances regeneration, shown by improved axon-to-Schwann cell coupling and increased axon area. The authors conclude that sensory protection of muscle does not require the distal nerve sheath, but that preservation of the distal sheath may contribute to enhanced nerve regeneration.

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James R BainM.Sc. M.D. 

Department of Surgery, Division of Plastic Surgery, McMaster University

1200 Main Street West, Hamilton

Ontario, Canada L8N 3Z5

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