表皮隆线于第4&5月形成，随真皮乳头的增高而渐趋明显。至第6个月，全部皮纹图样已可辨认。
The epidermal ridges appeared simultaneously with the secondary dermal ledges in 4th to 5th month and the dermatoglyphic configurations were recognizable in 6th month fetuses .
月纹