Human Fetus at 39 Weeks in the Womb (Caucasian Skin)

Description

A full-term fetus at 39 weeks of gestation lies in a flexed attitude within the amniotic sac, surrounded by amniotic fluid and enclosed by the thick, richly vascularised uterine wall. The head is well developed and covered with fine scalp hair, with the external ear, closed eyelids and rounded facial contour clearly modelled; the chin rests toward the chest while both hands are drawn up in front of the face and the knees and hips are fully flexed. The umbilical cord, showing the spiral course of the paired umbilical arteries around the single umbilical vein, passes from the abdominal insertion between the legs to the discoid placenta seen in section along the right uterine wall. Subcutaneous fat has smoothed the limb and trunk contours, giving the plump proportions characteristic of term. Week 39 is the anatomy of imminent labour, when fetal lung maturity, hepatic glucuronidation and thermoregulatory fat stores are essentially established and delivery carries the lowest neonatal morbidity. The depicted relationships underpin routine obstetric assessment: determination of presentation and lie, estimation of amniotic fluid volume, Doppler interrogation of umbilical artery flow, and localisation of the placenta before membrane rupture or caesarean section. The cord looped across the lower limbs illustrates the substrate for nuchal or body cord entanglement and, with reduced fluid volume, for cord compression during contractions. The placental section conveys the maternal-fetal exchange surface that must separate cleanly in the third stage. The image suits obstetric and midwifery teaching on term pregnancy, fetal presentation and cord anatomy, and supports antenatal class handouts and patient-facing material explaining what a baby looks like at full term. It functions equally well as a publication or textbook figure in embryology and obstetric atlases, and as reference imagery for ultrasound training resources, prenatal apps and maternity service communications. Anatomical accuracy verified by SciePro's Medical Advisory Board.