Chapter

The Lamprey Postural Circuit

Tatiana G. Deliagina, Pavel V. Zelenin and Grigori N. Orlovsky

in Handbook of Brain Microcircuits

Published on behalf of Oxford University Press

Published in print August 2010 | ISBN: 9780195389883
Published online September 2012 | e-ISBN: 9780199965137 | DOI: http://dx.doi.org/10.1093/med/9780195389883.003.0038
The Lamprey Postural Circuit

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This chapter describes postural neuronal networks responsible for the stabilization of the lamprey's body orientation in the gravity field. Their operation is based on the interaction between two antagonistic vestibulospinal reflexes mediated by reticulospinal neurons. The lamprey stabilizes its body orientation in a particular plane, at which the antagonistic reflexes are equal to each other. Individual reticulospinal neurons respond differently to deviations of the body from the stabilized position. These neurons affect differently the spinal motor output. The closed-loop microcircuits, formed by these neurons, operate in parallel to generate the resulting corrective response. The gradual change of the stabilized orientation is achieved through the change of the gain in the reflex chains.

Chapter.  2115 words.  Illustrated.

Subjects: Development of the Nervous System

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