A new congenital neuromuscular disease with trilaminar muscle fibers

S. P. Ringel, H. E. Neville, M. C. Duster, James Edwin Carroll

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


An infant was born with marked rigidity, a paucity of spontaneous movements, and increased serum creatine phosphokinase activity. Electromyogram was normal. A muscle biopsy, taken at the age of 7 weeks, contained numerous fibers composed of three concentric zones, warranting the designation “trilaminar fibers.” Electronmicroscopy showed the innermost zone contained a densely packed collection of mitochondria, glycogen, electron opaque material, and single filaments. The middle zone consisted of myofibrils with Z-band smearing. The outer zone resembled a sarcoplasmic mass. Extrajunctional acetylcholine receptor (AChR) was present in the trilaminar fibers between the middle and outer zones. The increased muscle tone and extrajunctional AChR suggest an altered neural nfluence, but the markedly increased creatine phosphokinase activity is more characteristic of muscle damage. Precise definition of the nature of the defect awaits further study.

Original languageEnglish (US)
Pages (from-to)282-289
Number of pages8
Issue number3
StatePublished - Jan 1 1978
Externally publishedYes

ASJC Scopus subject areas

  • Clinical Neurology


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