Somatotopy in the segmental innervation of the cat diaphragm

M. Fournier, Gary C Sieck

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A somatotopic organization in the segmental innervation of the cat diaphragm (DIA) was determined using evoked electromyographic responses and glycogen depletion of stimulated type II muscle fibers. With the use of the glycogen depletion method, the specific location and proportion of muscle fibers innervated by the fifth (C5) or sixth (C6) cervical ventral roots were determined for different regions of the DIA. The sternal and ventral portions of the costal and crural DIA regions were innervated primarily by C5. The dorsal portions of both the costal and crural regions were innervated primarily by C6. Thus the somatotopic organization in the segmental innervation of the DIA was not correlated with the anatomic division of the sternal, costal, and crural regions. Instead, the somatotopic projections of cervical ventral roots were organized in the ventrodorsal axis of each DIA region. This topographical pattern resulted in an extensive overlap of the DIA territories innervated by C5 and C6. Within a region, the fibers innervated by a specific ventral root were not randomly distributed but often followed fascicle divisions. This frequently resulted in a wide range in the proportion of fibers innervated by a ventral root even within a specific region.

Original languageEnglish (US)
Pages (from-to)291-298
Number of pages8
JournalJournal of Applied Physiology
Volume64
Issue number1
StatePublished - 1988
Externally publishedYes

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Diaphragm
Cats
Spinal Nerve Roots
Leg
Glycogen
Fast-Twitch Muscle Fibers
Muscles

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Somatotopy in the segmental innervation of the cat diaphragm. / Fournier, M.; Sieck, Gary C.

In: Journal of Applied Physiology, Vol. 64, No. 1, 1988, p. 291-298.

Research output: Contribution to journalArticle

Fournier, M & Sieck, GC 1988, 'Somatotopy in the segmental innervation of the cat diaphragm', Journal of Applied Physiology, vol. 64, no. 1, pp. 291-298.
Fournier, M. ; Sieck, Gary C. / Somatotopy in the segmental innervation of the cat diaphragm. In: Journal of Applied Physiology. 1988 ; Vol. 64, No. 1. pp. 291-298.
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