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INTERHEMISPHERIC RESPONSES IN THE OPOSSUM

INTERHEMISPHERIC RESPONSES IN THE OPOSSUM IN A. THE LENDE3 OPOSSUM1 RICHARD Division of Neurosurgery, University for of Colorado Medical June Center, Denver, Colorado (Received publication 29, 1964) PROBLEM OF TRANSFER of information between the two cerebral hemispheres in mammals has been the concern of recent investigations which have focused attention on the corpus callosum. It is noteworthy that the opossum, in common with other marsupials monotremes, lacks a corpus callosum. This observation, made in 1837 by Owen (IO), was elaborated by Smith (14) who, on anatomical grounds, considered that the anterior (ventral) commissure in the marsupials contained fibers joining the neocortices of the two hemispheres. He thus imputed to that commissure the function served by the corpus callosum in placental mammals. Our study was undertaken to investigate the nature of the response its pathway in the natural absence of the corpus callosum. THE MATERIALS METHODS Twenty opossums (Didelphis virginiana) were used. Anesthesia was usually provided by allobarbital urethane (Dial with urethane, Ciba). Usually the initial dose of 0.60 cc/kilogram of body weight was sufficient to give a steady state of anesthesia for the duration of a lo-hour experiment. In a few studies intravenous thiopental sodium followed by intravenous a-chloralose was used; in certain http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

INTERHEMISPHERIC RESPONSES IN THE OPOSSUM

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Publisher
The American Physiological Society
Copyright
Copyright © 1965 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
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Abstract

IN A. THE LENDE3 OPOSSUM1 RICHARD Division of Neurosurgery, University for of Colorado Medical June Center, Denver, Colorado (Received publication 29, 1964) PROBLEM OF TRANSFER of information between the two cerebral hemispheres in mammals has been the concern of recent investigations which have focused attention on the corpus callosum. It is noteworthy that the opossum, in common with other marsupials monotremes, lacks a corpus callosum. This observation, made in 1837 by Owen (IO), was elaborated by Smith (14) who, on anatomical grounds, considered that the anterior (ventral) commissure in the marsupials contained fibers joining the neocortices of the two hemispheres. He thus imputed to that commissure the function served by the corpus callosum in placental mammals. Our study was undertaken to investigate the nature of the response its pathway in the natural absence of the corpus callosum. THE MATERIALS METHODS Twenty opossums (Didelphis virginiana) were used. Anesthesia was usually provided by allobarbital urethane (Dial with urethane, Ciba). Usually the initial dose of 0.60 cc/kilogram of body weight was sufficient to give a steady state of anesthesia for the duration of a lo-hour experiment. In a few studies intravenous thiopental sodium followed by intravenous a-chloralose was used; in certain

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Mar 1, 1965

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