Permanent axotomy by amputation results in loss of motor neurons in man

Y. Kawamura, Peter J Dyck

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Morphometric assessment of the size distribution of cell bodies (cytons) in motor neuron columns from serial sections of lumbar spinal segments reproducibly yields three peaks. Using troughs between peaks as division points, it is possible to determine the number of large (C1), intermediate (C(i)), and small (C(s)) cytons per lumbar segment. In a patient with above-knee amputation 4 1/2 years previously, the number of C1 was 42%, C(i) 99%, and C(s) 129% that of normal. Nine years after total amputation of a lower limb for chondrosarcoma, a second patient exhibited values of 25%, 14%, and 55%, respectively. Normal results were obtained from the non-amputated sides. These results, and our previous studies on the permanent axotomy model, show that loss of target tissue by axotomy leads to atrophy and then loss of motor neurons. Extrapolated to the interpretation of morphologic abnormalities of proximal neuronal alterations in peripheral neuropathy, these results suggest that atrophy and loss of such proximal elements cannot be explained by acute distal pathology, but could be the result of chronic disorders, particularly when severe.

Original languageEnglish (US)
Pages (from-to)658-666
Number of pages9
JournalJournal of Neuropathology and Experimental Neurology
Volume40
Issue number6
StatePublished - 1981

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Axotomy
Motor Neurons
Amputation
Atrophy
Chondrosarcoma
Peripheral Nervous System Diseases
Lower Extremity
Knee
Pathology
Cell Body

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Neuroscience(all)

Cite this

Permanent axotomy by amputation results in loss of motor neurons in man. / Kawamura, Y.; Dyck, Peter J.

In: Journal of Neuropathology and Experimental Neurology, Vol. 40, No. 6, 1981, p. 658-666.

Research output: Contribution to journalArticle

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