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

Description

At approximately 23 weeks of gestation the fetus lies in a flexed attitude within the amniotic sac, the head turned toward the viewer in near profile and one hand drawn up against the face while the opposite arm rests across the chest. The trunk is curved with the hips and knees flexed, one foot tucked beneath the buttock, and the external ear, eyelids, nose and lips are clearly modelled on skin that remains thin and translucent over subcutaneous vessels. The umbilical cord emerges from the anterior abdominal wall and spirals in front of the flexed limbs, its two umbilical arteries and single umbilical vein visible through the covering of Wharton's jelly. Behind the fetus, the amniotic membrane and surrounding amniotic fluid separate it from the placental disc and the vascular uterine wall. Week 23 sits at the threshold of viability, and the anatomy shown underlies the clinical concerns of this period: pulmonary development in the canalicular to early saccular stage, low subcutaneous fat, and complete dependence on placental gas and nutrient exchange through the umbilical vessels. The relationship of cord to placenta illustrated here is the basis for umbilical artery Doppler assessment, cord coiling and insertion abnormalities, and diagnosis of fetal growth restriction. Fetal position, limb flexion and the volume of amniotic fluid are the same features assessed at the mid-trimester and follow-up anatomy scans, alongside placental site and biometry. The image suits obstetric and midwifery teaching on second-trimester development, antenatal counselling material explaining what the fetus looks like at 23 weeks, and figures in embryology atlases, prenatal ultrasound correlation guides and neonatology courses covering periviable birth. It also serves publishers, health websites and clinic waiting-room material as part of a week-by-week gestational series. Anatomical accuracy verified by SciePro's Medical Advisory Board.