Pregnant Woman at Week 13 of Gestation, Lateral View (Caucasian Skin)

Description

A pregnant woman's torso is shown in left lateral profile, the body wall rendered semi-transparent so that the pelvic and lower abdominal viscera read through the skin. Within the pelvis the anteverted uterus contains a single fetus at week 13, curled within the amniotic sac and attached by the umbilical cord to the developing placenta along the uterine wall. The cervix and vagina continue inferiorly, with the urinary bladder anterior and the rectum and sigmoid colon posterior; an ovary and uterine tube are visible lateral to the uterine fundus. Bony landmarks frame the section, the pubic bone anteriorly and the sacrum posteriorly, while the maternal hand rests on the lower abdomen and hip, and the external abdominal contour is still only slightly convex. Week 13 marks the transition into the second trimester, when organogenesis is essentially complete and the fetus enters a phase of rapid growth; crown-rump length measurement made at this stage remains the most reliable basis for dating a pregnancy. The view demonstrates why the uterine fundus is only just rising above the pelvic brim at this point, the anatomical reason first-trimester scanning is often transvaginal while later assessment is transabdominal. The spatial relationship of uterus to bladder, rectum and sacrum also underpins common early complaints of urinary frequency, pelvic pressure and low back discomfort, and it is the anatomy relevant to first-trimester screening and nuchal assessment timing. The illustration suits obstetric and midwifery teaching sequences that follow gestation week by week, antenatal patient education leaflets and clinic screens, prenatal app and website content, and textbook or journal figures on embryonic and fetal development. As part of a matched series from week 4 onward it allows educators and publishers to present consistent, comparable stages of uterine and fetal growth in one visual language. Anatomical accuracy verified by SciePro's Medical Advisory Board.