28 day old human embryo

---

28 day old human embryo with an intact chorion, the outermost fetal membrane. During the fourth week, the embryonic period begins and the brain, spinal cord, heart and other organs begin to form.

---

Size: 3894px × 2691px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 28, black, bw, chorion, day, development, embryo, embryonic, fetal, human, medical, membrane, period, white