Characteristic embryological findings: Fetal sex is clearly distinguishableby 12 weeks. The neck is well defined, the face is broad and the eyes are widely separated. By the end 12th weeks, erythropoiesis decreases in the liver and begin in the spleen. The decidua capsularis adheres to the decidua parietalis.
3D ultrasounds findings: Visualization by 3D ultrasounds in the 12th week of gestation enabled more detailed analysis of fetal anatomy, especially limbs. It is possible to count finger and toes. Growing cerebellum is clearly visible. Lateral ventricles dominate the brain.
3D power findings at 11th and 12th week of gestation: with the use of the 3D power dopller, it is possible to depict major branches aorta: common iliac and renal arteries. Circle of willis and it branches are easy visible. From this week, a more detailed anatomical survey can be obtained, including the cerebral and cardiovascular system and the digestive and urinary tracts. At the stage, pulsation of the midlle cerebral artery can be easily discerned as a several vessel. However, until the end of the tenth gestational week, the ultrasonic detected vascular network should be called intracranial circulation. Until the end of the first trimester, the absence of end-diastolic blood flow in fetal and placental components of the circulations is a normal physiological finding.
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