Centralization and Symmetry

Larry W. Swanson

in Brain Architecture

Second edition

Published on behalf of Oxford University Press

Published in print August 2011 | ISBN: 9780195378580
Published online September 2012 | e-ISBN: 9780199965120 | DOI:
Centralization and Symmetry

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This chapter examines the evolution of the nervous system in bilaterally symmetrical invertebrates, beginning with flatworms that are freely swimming predators. In these animals the nervous system becomes centralized into ganglia, nerves, and plexuses, and the process of cephalization or specialization of the nervous system in the head also begins. A topographic division of the nervous system into central and peripheral components is also apparent. In more highly evolved invertebrates the nervous system may display segments and, except in the head region, the central nervous system lies ventral to the digestive system.

Chapter.  3278 words.  Illustrated.

Subjects: Development of the Nervous System

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