Pregnant Woman at Week 18 of Gestation, Lateral View (Brown Skin)

Description

The maternal torso is shown in profile with the abdominal wall rendered translucent, exposing the gravid uterus occupying the lower abdomen and true pelvis. Inside the intact amniotic sac an 18-week fetus lies in a flexed attitude, head directed inferiorly toward the cervix, with the umbilical cord looping from the ventral abdominal wall to the placental disc implanted along the uterine wall. The enlarging fundus displaces loops of small intestine superiorly and posteriorly, while the urinary bladder lies anterior and inferior to the uterus and the rectum passes behind it toward the pelvic outlet. The cervix and upper vagina are visible in continuity below the uterine body, framed by the translucent pelvic bones. At around 18 weeks of gestation the uterine fundus approaches the level midway between the pubic symphysis and umbilicus, and fundal height measurement becomes a practical clinical marker of growth. This midtrimester interval is when the detailed anatomy ultrasound is typically performed, fetal movements may first be perceived as quickening, and placental location relative to the cervix is documented. The relationship shown here between the enlarging uterus, compressed bladder and displaced bowel underlies common midtrimester complaints of urinary frequency, low back strain and altered bowel habit, and explains the lumbar lordosis and postural adaptation reflected in the model's stance. The illustration suits obstetric and midwifery teaching sequences that track uterine growth week by week, antenatal class handouts, and patient-facing material explaining what happens at the anatomy scan. It also serves publishers of pregnancy atlases and parenting guides, prenatal app content, and clinic display material where a clear sagittal relationship between fetus, placenta, bladder and rectum is required. As one image in a continuous gestational series, it supports side-by-side comparison of fetal size and uterine position across pregnancy. Anatomical accuracy verified by SciePro's Medical Advisory Board.