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Pronunciation: fas-tij'e-um


  1. Apex of the roof of the fourth ventricle of the brain, an angle formed by the anterior and posterior medullary vela extending into the substance of the vermis.
  2. The acme or period of full development of a disease.

[L. top, as of a gable; a pointed extremity]

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© Copyright 2019 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.