FIG 3. Successive images show developmental changes of lateral configuration of brain, germinal matrix, and ventricular system. The brain surfaces (upper row), germinal matrix (middle row, orange), and ventricular system (lower row, blue) of human fetal brain were reconstructed by surface rendering. The volume of the germinal matrix increased until 23 weeks' GA and decreased rapidly at 28 weeks' GA. Note how lateral ventricles change from fetal type, with vesicular aspect and bicornuate shape, to adult type with increasing GA.