Human Fetus at 21 Weeks in the Uterus, Lateral View (Brown Skin)

Description

Seen from the side, the maternal torso is rendered semi-transparent so the gravid uterus occupies the lower abdomen and pelvis, its fundus reaching toward the level of the umbilicus. Inside the amniotic sac a fetus of about 21 weeks lies in a flexed attitude with the head directed inferiorly toward the cervix, limbs drawn toward the trunk, and the umbilical cord looping from the abdominal insertion to the placental disc on the uterine wall. Adjacent pelvic structures are visible in the same projection: the cervix and vagina below the uterine body, the urinary bladder anteriorly behind the pubic symphysis, the rectum and sacrum posteriorly, and loops of maternal bowel displaced superiorly by the enlarging uterus. The maternal hands resting on the abdomen and lumbar region give scale to the change in body contour. Mid-second-trimester anatomy of this kind underpins routine obstetric assessment. Around 20 to 22 weeks the anomaly scan surveys fetal biometry, cardiac outflow tracts, spine and limbs, while placental site and cord insertion are documented; fundal height measurement begins to correlate with gestational age. The lateral projection also clarifies why bladder compression, urinary frequency, lumbar lordosis and low back discomfort are common at this stage, and it demonstrates the spatial relationships that matter when interpreting cervical length or planning amniocentesis and later transabdominal procedures. The image suits obstetric and midwifery teaching sets, antenatal class handouts and clinic posters that follow pregnancy week by week, and works as a companion to the earlier embryonic and first-trimester frames of the same series. Publishers of pregnancy guides, women's health websites and app developers can use it to show fetal position, placental attachment and maternal organ displacement in a single view without cluttered labelling. Anatomical accuracy verified by SciePro's Medical Advisory Board.