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Neuronal Control of LocomotionFrom Mollusc to Man$
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Grigori Orlovsky, T. G. Deliagina, and Sten Grillner

Print publication date: 1999

Print ISBN-13: 9780198524052

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198524052.001.0001

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Other forms of locomotion in molluscs

Other forms of locomotion in molluscs

(p.31) 2 Other forms of locomotion in molluscs
Neuronal Control of Locomotion

G. N. Orlovsky

T. G. Deliagina

S. Grillner

Oxford University Press

This chapter focuses on the other forms of locomotion, such as crawling and swimming, in molluscs. In most species of gastropod molluscs, crawling is the main form of locomotion. However, in addition to crawling, certain species can swim. The escape-swimming response of the marine mollusc Tritonia diomedea can be initiated by a number of noxious stimuli, and under natural conditions is usually initiated by transient epithelial contact with the tube feet of predatory sea stars. The central nervous system of Tritonia has the same basic structure as that of Clione. Body flexions are controlled by motor neurons located in the pedal ganglia. Two groups of pedal-efferent neurons, presumably motor neurons, display rhythmical bursting activity during swimming. The initiation and maintenance of swimming in Tritonia depend on the establishment of a long-lasting ramp depolarization in both premotor rhythm-generating interneurons, and in the motor neurons.

Keywords:   locomotion, gastropod molluscs, noxious stimuli, Tritonia diomedea, body flexions, motor neurons

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