Human Fetus at 27 Weeks in the Womb (Brown Skin)

Description

A fetus of approximately 27 weeks gestation lies tightly flexed within the uterine cavity, seen at close range so that the crown and temporal region of the head fill the lower field while the flexed lower limbs occupy the upper field. The plantar surface of one foot is turned toward the viewer, showing the heel pad, well-formed toes and the transverse plantar creases characteristic of the late second and early third trimester. Fine scalp hair is visible over the occiput, the auricle of the ear is fully modelled with a defined helix, and subcutaneous fat has begun to smooth the contours of the thigh, leg and shoulder. The umbilical cord passes between the limbs, its spiralled course revealing the paired umbilical arteries and single umbilical vein beneath the translucent amnion, with the vascular uterine wall enclosing the fetus. At 27 weeks the fetus stands at the threshold of the third trimester, a period of active pulmonary surfactant production, rapid brain growth and increasing fat deposition, and this attitude of universal flexion is the normal posture assessed on ultrasound biophysical profile scoring. The relationship of the cord to the limbs and neck illustrated here underpins discussion of nuchal and body cord loops and cord compression, while limb and foot morphology at this stage supports biometric dating and the recognition of positional deformities. Skin maturity, nail and crease development and scalp hair are the same features used in postnatal gestational age assessment of a preterm infant. This rendering suits obstetric and midwifery teaching on third-trimester fetal development, antenatal classes and parent-facing material explaining what the baby looks and behaves like at 27 weeks, and neonatology modules on prematurity and viability. It also works as a figure in embryology and prenatal ultrasound atlases, and in editorial or campaign material where an ethnically representative fetal image is required. Anatomical accuracy verified by SciePro's Medical Advisory Board.