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Cephalopod NeurobiologyNeuroscience Studies in Squid, Octopus and Cuttlefish$
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N. Joan Abbott, Roddy Williamson, and Linda Maddock

Print publication date: 1995

Print ISBN-13: 9780198547907

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198547907.001.0001

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Cerebrovascular organization and dynamics in cephalopods

Cerebrovascular organization and dynamics in cephalopods

(p.459) 28 Cerebrovascular organization and dynamics in cephalopods
Cephalopod Neurobiology

N. Joan Abbott

J. A. Miyan

Oxford University Press

This chapter reviews the anatomy and physiology of the cerebral circulation in cephalopods, and its behaviour in experimental preparations. Cephalopods have a closed vasculature, and the arrangement of cerebral arteries, arterioles, capillaries, and veins follows a similar pattern to that of vertebrates, with some differences at the electron microscopic level. ‘Gliovascular’ channels may act as routes for flow of interstitial fluid while ‘lymphoid’ channels return the fluid to the venous system. Cephalopod molluscs are the only invertebrate animal group to possess a fully closed vascular system in which a substantial hydrostatic pressure is generated by the heart. However, the relative inefficiency of cephalopod haemocyanin compared with vertebrate haemoglobin as blood oxygen transport protein means that the cephalopod vascular system is forced to work close to its physiological limits. The cardiovascular specializations that are necessary to maintain tissue oxygen supply in cephalopods give instructive insights into basic principles of cardiovascular physiology. Cephalopod neural tissue, in common with neural tissues in most animal groups, maintains a high metabolic rate and a predominantly aerobic metabolism, requiring efficient supply of oxygen and aerobic substrates from the blood. Comparison of the vascularity of brain and non-brain tissues and study of regional differences within the brain can highlight important aspects of neural metabolism.

Keywords:   Cephalopods, haemocyanin, cerebrovascular, neural tissue, aerobic metabolism, non-brain tissue

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