The dedicated 3D model depicts the human fetus at week 18, when the external ears have reached their final position and the inner ear structures are maturing toward the ability to perceive sound, which usually emerges over the following weeks. It shows the fetus with more defined facial features and limbs, reflecting the onset of nerve myelination and increasingly purposeful movements such as flexing the arms and legs. Week 18 opens the typical window for the mid-pregnancy anatomy scan, performed between weeks 18 and 22 to assess fetal organs, growth, and placental position.
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