8 weeks: Embryo is 25 millimeters {cerebral cortex development}. Face has eyes, ears, and nose. Arms and legs have fingers and toes. Embryo has small tail and all internal organs. Brainstem has many projections into cerebral cortex to guide cortical-neuron migration and differentiation. Eight weeks ends embryonic period and begins fetal period.
4-Zoology-Development-Stages-Gestation
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Date Modified: 2022.0225