K. Hardy (2012) CIL:39006, Homo sapiens, embryonic cell. CIL. Dataset

Light micrograph of a human embryo at the blastocyst stage, about six days after fertilization. The embryo is in the process of "hatching" out of the zona pellucida - the tough outer membrane - just before implanting in the wall of the uterus. The actual size of the embryo is about 0.3 mm.

人类胚胎在胚泡阶段的显微照片，受精后约六天。胚胎正处于从透明带——坚韧的外层膜——中‘孵化’出来的过程，恰好在植入子宫壁之前。胚胎的实际大小约为0.3毫米。