Human Fetus at 28 Weeks in the Womb (Black Skin)

Description

The fetus lies in a flexed attitude within the intact amniotic sac, seen in left lateral profile with the head high and to the left, the spine curved and the hips and knees drawn up. Surface detail at this stage of gestation includes a well-formed auricle, closed eyelids, defined fingers reaching upward toward the sac membrane, and separated toes on both feet. The umbilical cord leaves the abdomen and spirals through the amniotic fluid to its insertion on the fetal surface of the placenta, where the paired umbilical arteries and single umbilical vein branch across the chorionic plate. The placental disc is applied to the thickened, vascularised endometrium of the uterine wall, which frames the amniotic cavity on all sides. At 28 weeks the fetus enters the third trimester, a threshold used clinically for viability counselling, corticosteroid and neonatal intensive care planning, and interpretation of growth on serial biometry. Depictions of cord length, coiling and placental insertion site support discussion of cord entanglement, velamentous or marginal insertion, and Doppler assessment of umbilical artery flow. Amniotic fluid volume relative to fetal size at this gestation underpins assessment of oligohydramnios and polyhydramnios, while the placental position against the uterine wall is central to explaining placenta praevia and abruption. The rendering suits obstetric and midwifery teaching sequences that track fetal development week by week, antenatal class materials, and patient-facing leaflets explaining third-trimester growth and movement. Publishers of embryology and obstetrics atlases can use it as a companion figure alongside the earlier weeks in this series, and ultrasound training resources can pair it with sonographic images to orient learners to fetal lie and cord anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.