Historical Aspects; Prenatal Measurements; Prenatal Age; Early Stages; Stage 8: The First Appearance of the Nervous System; Stage 9: The Major Divisions of the Brain; Stage 10: The Neural Tube and the Optic Primordium; Stage 11: Closure of the Rostral Neuropore; Stage 12: Closure of the Caudal Neuropore and the Beginning of Secondary Neurulation; Stage 13: The Closed Neural Tube and the First Appearance of the Cerebellum: Stage 14: The Future Cerebral Hemispheres; Stage 15: Longitudinal Zoning in the Diencephalon; Stage 16: Evagination of the Neurohypophysics; Stage 17: The Future Olfactory Bulb and the First Amygdaloid Nuclei; Stage 18: The Future Corpus Striatum, the Inferior Cerebellar Peduncle, and the Dentate Nucleus; Stage 19: The Choroid Plexus of the Fourth Ventricle and the Medical Accessory Olivary Nucleus; Stage 20: The Choroid Plexus of the Lateral Ventricles, the Optic and Habenular Commissures, and the Interpeduncular and Septal Nuclei.
