Human Fetus at 20 Weeks in the Womb (Caucasian Skin)

Description

At roughly 20 weeks of gestation the fetus is shown in left lateral profile, curled in the characteristic flexed posture within the translucent amniotic sac. The disproportionately large head shows a smooth, hairless scalp, fused closed eyelids, a formed external ear with a defined auricle, and recognisable facial features. One upper limb is raised with the fingers separated and individual digits clearly distinguishable, while the lower limbs are flexed at the hips and knees with the feet crossed near the midline. The umbilical cord leaves the anterior abdominal wall at the umbilicus, its coiled arteries and vein visible through the cord surface, and runs toward the discoid placenta seen against the vascularised uterine wall in the background, with amniotic fluid filling the surrounding cavity. The midpoint of gestation is the reference stage for the detailed second-trimester ultrasound survey, when biometric measurements such as biparietal diameter, head and abdominal circumference and femur length are used to confirm dating and assess growth. This stage is also when limb and digit formation, facial profile, placental site and cord insertion are systematically examined, and when amniotic fluid volume becomes a clinically monitored parameter. Fetal movement is typically first perceived by the mother around this period, and the anatomy shown underlies discussions of placental position, cord anatomy and viability thresholds in obstetric counselling. Suited to obstetric and midwifery teaching resources, embryology and human development atlases, and antenatal class material where a realistic depiction of the mid-gestation fetus supports explanation of ultrasound findings. It works equally well for patient-facing pregnancy guides, prenatal app and website content, and editorial or publication figures tracing week-by-week development as part of a continuous gestational series. Anatomical accuracy verified by SciePro's Medical Advisory Board.