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Human embryo 23 mm CRL 9 GW assessed by vaginal ultrasound. Sagittal (A), slightly parasagittal (B), coronal (A, B), axial (D) and oblique (C) sections obtained from 3D volume are shown. D: diencephalon, M: mesencephalon, LV: lateral ventricle, 4thV: fourth ventricle, FC: falx cerebri, TV: telencephalic vesicles, CP: choroid plexus, Sy: cerebral aqueduct, 3rd V: third ventricle.
