Human Fetus at 25 Weeks in the Womb (Asian Skin)

Description

The fetus is shown in the third-trimester flexed attitude, head presenting inferiorly and to the right, spine curved, hips and knees drawn up so that one foot rises toward the chest and both hands lie close to the face. Surface detail matches roughly 25 weeks of gestation: fine scalp hair, a fully formed and unfurled auricle, separated fingers and toes, and thin skin over a body with little subcutaneous fat, so the underlying contours remain visible. The umbilical cord leaves the abdomen at the umbilicus and spirals across the fetal trunk toward the fetal surface of the placenta, its two umbilical arteries and single umbilical vein distinguished by colour beneath the amniotic covering. The placenta is implanted on the uterine wall as a thick discoid organ with a branching chorionic vascular tree converging on the cord insertion, while the translucent membranes bound the surrounding amniotic cavity. At 25 weeks the fetus is beyond the usual threshold of viability, a stage when obstetric decisions about corticosteroids, tocolysis and transfer to a neonatal intensive care unit are made. The depicted relationships are the ones assessed at the mid to late second-trimester ultrasound: placental site and thickness, cord insertion, coiling and vessel number, amniotic fluid volume, and fetal lie and presentation. Understanding this arrangement underpins recognition of conditions such as intrauterine growth restriction, single umbilical artery, marginal or velamentous cord insertion, and cord entanglement. The rendering suits obstetric and midwifery teaching on fetal growth and placental circulation, embryology and developmental anatomy lectures, and antenatal class or clinic material explaining to expectant parents how the baby is positioned and nourished at this point in pregnancy. It also serves publishers and app developers building week-by-week gestational timelines and journal or textbook figures on fetoplacental anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.