Human Fetus at 38 Weeks in the Womb (Caucasian Skin)

Description

At 38 weeks of gestation the fetus fills the uterine cavity, shown here in a flexed attitude with the spine curved, thighs drawn onto the abdomen and the arms folded across the chest so the hands lie near the face. The head, positioned inferiorly and to the left of the frame, displays a rounded calvaria covered by fine scalp hair, a well-formed external ear with defined helix and antihelix, and closed eyelids. Subcutaneous fat has smoothed the contours of the cheeks, limbs and digits, and the fingers and toes carry visible nails. The translucent amniotic membrane encloses the fetus and its amniotic fluid, while the vascular uterine wall and a shadowed segment of placental surface frame the sac from behind. Week 38 marks early term, when organ maturation, particularly pulmonary surfactant production and thermoregulatory brown fat deposition, has reached the point compatible with unassisted extrauterine life. The flexed, longitudinal lie illustrated here corresponds to the cephalic presentation assessed clinically by Leopold manoeuvres and confirmed on ultrasound before labour. The relationship between fetal size, amniotic fluid volume and the uterine wall underpins fundal height measurement, estimation of fetal weight and the diagnosis of oligohydramnios or polyhydramnios, while the intact membranes shown are the structure whose rupture defines the onset of many labours. This rendering suits obstetric and midwifery teaching on term pregnancy, fetal presentation and the third trimester, and serves as the final plate in week-by-week developmental sequences used in embryology courses and anatomical atlases. It is equally effective in antenatal class handouts, patient education material on labour and delivery, hospital and clinic websites, and editorial or publication figures requiring an accurate depiction of the full-term intrauterine fetus. Anatomical accuracy verified by SciePro's Medical Advisory Board.