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FIG 2. Rendering of the embryologic development of the fourth ventricle.
Axial section of a 27-mm human embryo (approximately day 56 and Carnegie stage 22) shows ventral fourth ventricular furrow (arrow) deeply indenting the posterior aspect of the developing metencephalon.
Modified from M. Hill, UNSW Embryology, version 3.0 (8), with permission.
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