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

Description

The fetus lies in a flexed, left-lateral attitude inside the translucent amniotic sac, filling much of the amniotic cavity of the uterus. The large domed cranium, prominent forehead and low-set external ear reflect the cephalic proportions typical of mid-gestation, while the fused eyelids remain closed. The upper limbs are drawn toward the face with fully separated fingers, and the lower limbs are crossed at the ankles with distinct toes, showing complete digital separation by this stage. The umbilical cord emerges from the anterior abdominal wall and spirals toward the fetal surface of the discoid placenta, its two umbilical arteries and single umbilical vein visible as coiled vessels branching over the chorionic plate against the vascular endometrium and myometrium behind. Twenty weeks marks the conventional midpoint of pregnancy and the window in which the detailed second-trimester anomaly scan is performed, when biometry such as biparietal diameter, head and abdominal circumference and femur length are measured, and cardiac, spinal and renal anatomy are systematically surveyed. The view demonstrates relationships central to obstetric practice: placental site and cord insertion, amniotic fluid volume surrounding the fetus, and the free mobility that precedes a settled presentation. It also provides orientation for procedures such as amniocentesis and for discussions of fetal growth restriction, oligohydramnios and cord anatomy. The rendering suits obstetric and midwifery teaching, embryology and prenatal development atlases, antenatal class handouts and patient-facing material explaining what an ultrasound at mid-pregnancy depicts. It works as a comparative figure within a week-by-week gestational series for textbooks, apps and journal illustrations, and supports counselling resources for expectant parents. Anatomical accuracy verified by SciePro's Medical Advisory Board.