Human Fetus at 23 Weeks in the Womb (Caucasian Skin)

Description

A fetus at approximately 23 weeks of gestation lies in a left lateral orientation within the intact amniotic sac, suspended in amniotic fluid against the vascularised uterine wall. The head is disproportionately large relative to the trunk, with the developing auricle of the external ear clearly modelled, closed eyelids, and one flexed upper limb bringing the hand to the face — a posture typical of second-trimester fetal hand-to-mouth activity. The lower limbs are strongly flexed at the hips and knees with the feet drawn toward the trunk, and the skin appears thin and reddish, still lacking substantial subcutaneous fat. The umbilical cord emerges from the anterior abdominal wall and spirals in front of the flexed knees, its two umbilical arteries and single umbilical vein rendered in contrasting colour where they twist within the cord, and the placenta forms the darker discoid mass along the uterine wall behind the fetus. The 23-week stage sits at the threshold of viability, making it central to counselling in threatened preterm labour, preterm premature rupture of membranes and decisions about antenatal corticosteroids or neonatal intensive care. This is also the interval in which mid-trimester anomaly scanning, fetal biometry and Doppler assessment of the umbilical artery are used to judge growth and placental function, so the spatial relationship between cord insertion, cord coiling and placental site shown here has direct sonographic relevance. Cord coiling patterns, amniotic fluid volume and fetal position are all observations routinely made at this gestation. The rendering suits obstetric and midwifery teaching sequences on trimester-by-trimester development, embryology and human development textbook figures, and antenatal class or patient-facing material explaining what the baby looks like near the end of the second trimester. It also serves ultrasound training resources, prenatal care apps and editorial features on pregnancy for lay audiences. Anatomical accuracy verified by SciePro's Medical Advisory Board.