Human Fetus at 20 Weeks in the Womb (Caucasian Skin)

Description

At roughly 20 weeks of gestation the fetus lies in a flexed attitude within the translucent amniotic sac, head turned toward the viewer and limbs drawn across the midline. Body proportions are typical for the midtrimester: a relatively large cranium with a smoothly modelled scalp, a formed external ear with recognisable helix and concha, closed eyelids, and slender arms whose hands carry separated fingers held near the face. The lower limbs are folded at hip and knee with fully divided toes on both feet. The umbilical cord emerges from the anterior abdominal wall at the umbilicus and spirals through the amniotic cavity, its paired umbilical arteries and single umbilical vein visible as red and blue channels, inserting near the centre of the discoid placenta. The placenta lies against the uterine wall, its fetal surface traced by branching chorionic vessels. The midtrimester is the standard window for detailed fetal anatomical survey, and this arrangement mirrors what sonography assesses: fetal lie and attitude, biometry of head and limbs, amniotic fluid volume within the sac, placental position and cord insertion site. Marginal or velamentous cord insertion, single umbilical artery, and abnormal placental location are all identified against a normal reference such as this. The visible relationship between cord, placental disc and uterine wall also underpins discussion of cord entanglement, amniocentesis planning and the fetomaternal exchange that supports growth from this point onward. The rendering suits obstetric and midwifery teaching sequences that track gestation week by week, prenatal class handouts, and patient-facing material explaining what the anomaly scan looks at. Publishers of embryology and obstetric atlases, antenatal clinic displays and pregnancy applications can pair it with the earlier weeks of this series to show developmental progression from embryo to recognisably formed fetus. Anatomical accuracy verified by SciePro's Medical Advisory Board.