derencephaly
(dĕr′ĕn-sĕf′ə-lē)- A malformation in which the skull bones are underdeveloped and the cervical vertebrae are bifurcated, with a rudimentary brain usually resting in the cleft.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.