Human Fetus at 17 Weeks in the Womb (Caucasian Skin)

Description

A fetus of approximately 17 weeks gestation lies curled in a flexed attitude within the translucent amniotic sac, seen in left lateral profile against the vascular uterine wall. The head is large relative to the trunk, with a smooth domed calvaria, closed fused eyelids, a formed auricle with early helical folding, and a defined nasal bridge and lips. One upper limb is raised toward the face with the fingers loosely clenched, while the lower limbs are drawn up and crossed at the level of the abdomen. The umbilical cord emerges from the mid-abdominal umbilical ring and spirals to its right, its single umbilical vein and paired umbilical arteries visible through the cord surface as it inserts into the discoid placenta suspended within amniotic fluid. This stage of the second trimester corresponds to the window in which detailed obstetric ultrasound assessment becomes productive: biometry such as biparietal diameter and femur length, survey of the fetal limbs and digits, cardiac outflow views, and evaluation of placental position and cord insertion. The relationship shown between cord, amniotic cavity and placenta underlies the discussion of marginal or velamentous insertion, cord coiling, and amniotic fluid volume. Fetal movement is present but not yet reliably perceived by the mother, and the closed eyelids and thin skin illustrated here reflect normal maturation at this gestational age. The rendering suits obstetric and midwifery teaching sequences on trimester-by-trimester development, antenatal clinic and patient education material explaining what a scan at seventeen weeks shows, and embryology or reproductive biology chapters requiring a consistent series of staged fetal images. It also serves publishers, health apps and pregnancy information campaigns needing an accurate, non-clinical view of the intrauterine environment. Anatomical accuracy verified by SciePro's Medical Advisory Board.