Human Fetus at 23 Weeks in the Womb, Lateral View (Black Skin)

Description

A fetus of approximately 23 weeks gestation lies in a flexed attitude within the intact amniotic sac, seen from the left side. The head is disproportionately large relative to the trunk, with a prominent forehead, closed eyelids, formed external ear and a partly open mouth. The upper limbs are folded across the chest with the hands close to the face and the fingers distinct; the lower limbs are drawn up in the characteristic fetal posture, showing well-modelled knees, ankles and separated toes. The translucent amniotic membrane encloses the fetus and its amniotic fluid, while the umbilical cord emerges anteriorly from the abdominal wall and passes toward the vascular placental surface behind. The surrounding uterine wall and endometrium frame the gestational compartment in warm, backlit tones. The twenty-third gestational week sits within the mid second trimester, the period when detailed sonographic surveys assess growth, limb and facial morphology, placental position and amniotic fluid volume. Fetal position, cord insertion and the relationship of the placenta to the uterine wall shown here are the same relationships assessed on anomaly scans and in counselling about the threshold of viability. Skin is still thin and translucent with little subcutaneous fat, lung development remains in the canalicular to early saccular phase, and fetal movement and startle responses are well established, all of which underpin discussions of preterm birth risk and neonatal prognosis at this stage. Suitable for obstetric and midwifery teaching sequences illustrating week-by-week fetal growth, embryology and developmental anatomy lectures, and antenatal education materials that help expectant parents visualise the fetus at the end of the second trimester. The image also works as a publication or website figure for prenatal ultrasound reference, fetal medicine articles and patient-facing pregnancy timelines. Anatomical accuracy verified by SciePro's Medical Advisory Board.