The organization of the motoneurons innervating the axial musculature of vertebrates. II. Florida water snakes (Nerodia fasciata pictiventris)

The Journal of Comparative Neurology
J R Fetcho

Abstract

The motor pools of axial muscles in Florida water snakes (Nerodia fasciata pictiventris) were studied by applying horseradish peroxidase (HRP) to branches of spinal nerves innervating individual muscles or groups of muscles. Motor pools of different muscles or muscle groups were located in characteristic positions in both the transverse and the longitudinal extent of the motor column. Epaxial pools were located ventromedially in the column, segregated from most hypaxial ones, which were dorsolateral. The only exception to this general rule was the motoneurons innervating the levator costae muscle. Some of the motoneurons innervating this hypaxial muscle were located in the ventral part of the motor column, like epaxial motoneurons, but they were segregated longitudinally from epaxial ones. The arrangement of the motor pools was strikingly similar to the motor pools of presumptive homologous muscles in rats (Smith and Hollyday: J. Comp. Neurol. 220:29-43, '83), even though the locomotor mechanics in the two animals are very different. The similarities may reflect a comparable relationship between the location of motoneurons in the motor column and the location, in embryonic life, of the muscles they innervate. They also suggest ...Continue Reading

References

Jul 6, 1979·Brain Research·E E BrinkD W Pfaff
Oct 1, 1978·The Journal of Comparative Neurology·F J RichmondV C Abrahams
Oct 1, 1985·Journal of Neurophysiology·W Graf, R Baker
Oct 10, 1983·The Journal of Comparative Neurology·C L Smith, M Hollyday
Aug 1, 1951·The Journal of Comparative Neurology·J M SPRAGUE

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Citations

May 1, 1994·Journal of Magnetic Resonance Imaging : JMRI·A G Filler
Aug 14, 2020·Journal of Anatomy·Hiroshi NagashimaNoboru Sato
Dec 8, 1988·The Journal of Comparative Neurology·D B WakeG Roth
Aug 22, 1990·The Journal of Comparative Neurology·S TyrrellK W Tosney

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