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Titolo:
Size of myelinated nerve fibres is not increased by expansion of the peripheral field in cats
Autore:
Gordon, T; Rafuse, VF;
Indirizzi:
Univ Alberta, Dept Pharmacol, Div Neurosci, Edmonton, AB T6G 2H7, Canada Univ Alberta Edmonton AB Canada T6G 2H7 sci, Edmonton, AB T6G 2H7, Canada Dalhousie Univ, Dept Anat & Neurobiol, Halifax, NS B3H 4H7, Canada Dalhousie Univ Halifax NS Canada B3H 4H7 iol, Halifax, NS B3H 4H7, Canada
Titolo Testata:
JOURNAL OF PHYSIOLOGY-LONDON
fascicolo: 3, volume: 532, anno: 2001,
pagine: 835 - 849
SICI:
0022-3751(20010501)532:3<835:SOMNFI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GASTROCNEMIUS-MUSCLE; LOW-FREQUENCY ACTIVATION; SLOW ALPHA-MOTONEURONS; TRICEPS SURAE MUSCLES; MOTOR-UNIT PROPERTIES; AXONAL CALIBER; GROWTH-FACTOR; NEUROFILAMENT TRANSPORT; SYMPATHETIC INNERVATION; CONDUCTION-VELOCITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Gordon, T Univ Alberta, Fac Med, Div Neurosci, Heritage Med Res Ctr, Edmonton, AB T6G 2S2, Canada Univ Alberta Edmonton AB Canada T6G 2S2 ton, AB T6G 2S2, Canada
Citazione:
T. Gordon e V.F. Rafuse, "Size of myelinated nerve fibres is not increased by expansion of the peripheral field in cats", J PHYSL LON, 532(3), 2001, pp. 835-849

Abstract

1. This study tests the hypothesis that target size regulates the size of myelinated sensory and motor fibres in peripheral nerves. Cat medial gastrocnemius (MG) muscles were partially denervated and the size of the remaining nerve fibres that sprouted was examined 6.4 +/- 0.9 months later to determine whether nerve fibre size increased with target size.2. Electrophysiological and morphometric analyses were used to quantify myelinated nerve fibre size. Charge measurements fr om dorsal and ventral roots were used to electrophysiologically quantify the relative number of cut nerve fibres and the average size of the remaining intact sensory and motornerve fibres. Medial gastrocnemius muscle and motor unit forces provided indirect measurements of the increase in target size. Conduction velocities and amplitude of unitary action potentials of motor nerve fibres innervating single motor units were also measured after partial denervation.3. Electrophysiological measurements of nerve fibre size and morphometric measurements of enter fibre perimeters and fibre areas concurred and demonstrated that myelinated nerve fibres supplying partially denervated MG muscles did not increase in size in parallel with the increase in the target size.4. Thus, unlike non-myelinated nerve fibres, the size of myelinated nerve fibres does not increase as target size increases. Retrograde control of size in non-myelinated but not in myelinated nerve fibres demonstrates differences in plasticity of neurons in the somatic and autonomic nervous systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 10:38:06