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Physiological Reviews, Vol. 81, No. 2, April 2001, pp. 929-969
Copyright ©2001 by the American Physiological Society
Laboratoire de Neurobiologie des Fonctions Végétatives, Département de Physiologie et Neurophysiologie, Faculté des Sciences et Techniques Saint Jérôme, Marseille, France
Jean, André
Brain Stem Control of Swallowing: Neuronal Network and
Cellular Mechanisms. Physiol. Rev. 81: 929-969, 2001.
Swallowing movements are produced by a central pattern generator
located in the medulla oblongata. It has been established on the basis
of microelectrode recordings that the swallowing network includes two
main groups of neurons. One group is located within the dorsal medulla
and contains the generator neurons involved in triggering, shaping, and
timing the sequential or rhythmic swallowing pattern. Interestingly,
these generator neurons are situated within a primary sensory relay,
that is, the nucleus tractus solitarii. The second group is located in
the ventrolateral medulla and contains switching neurons, which
distribute the swallowing drive to the various pools of motoneurons
involved in swallowing. This review focuses on the brain stem
mechanisms underlying the generation of sequential and rhythmic
swallowing movements. It analyzes the neuronal circuitry, the cellular
properties of neurons, and the neurotransmitters possibly involved, as
well as the peripheral and central inputs which shape the output of the
network appropriately so that the swallowing movements correspond to
the bolus to be swallowed. The mechanisms possibly involved in pattern
generation and the possible flexibility of the swallowing central
pattern generator are discussed.
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