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Embryo 51 Day Old with Visible Spinal Cord
Computer Generated Image from Micro-MRI, actual size of embryo = 18.0 mm - This image presents a left-dorsal view of the embryo during the eighth week of development. This age is calculated from the day of fertilization. The spinal cord can be discerned. The groove-like structure on the bottom part of the head indicates a developing external ear, called the auricle. The bulging, round structure near the front of the face is the eye where developing eyelids begin to close up. The limbs can be seen to have elongated.