Human Fetus at 24 Weeks in the Womb, Lateral View (Black Skin)

Description

A fetus at approximately 24 weeks of gestation lies in a flexed, left lateral attitude within the intact amniotic sac, surrounded by amniotic fluid and bounded by the vascularised uterine wall and the adjacent placental surface. The head is large relative to the trunk, with fused eyelids, a formed external ear, and fine scalp hair beginning to show; one hand rests against the cheek while the opposite arm crosses the chest. The lower limbs are drawn up with the knees flexed and the feet crossed near the midline, and the umbilical cord loops across the abdomen from the umbilicus, its two coiled umbilical arteries and single umbilical vein distinguishable through the translucent Wharton's jelly. At 24 weeks the fetus reaches the conventional threshold of viability, a milestone that shapes obstetric counselling, decisions about antenatal corticosteroids and tocolysis, and planning for neonatal intensive care in threatened preterm birth. This period corresponds to canalicular lung development, when terminal sacs and surfactant production begin, and to rapid growth in biparietal diameter, femur length and abdominal circumference measured at second-trimester ultrasound. The cord anatomy shown is relevant to assessment of cord coiling, single umbilical artery, and Doppler studies of umbilical arterial flow in suspected fetal growth restriction. The rendering suits obstetric and midwifery teaching on second-trimester development, antenatal classes and clinic wall charts, and patient-facing material explaining what parents see on a mid-pregnancy scan. It also serves embryology and neonatology textbooks, publication figures on viability and preterm care, and consistent week-by-week gestational series produced for publishers and health education campaigns. Anatomical accuracy verified by SciePro's Medical Advisory Board.