Dr. Yasui's talk will clarify how perceptions and representations of the fetus in Japan have changed through time, predominantly between the 18th and 20th centuries. The talk will focus on the Tainai totsuki zu 胎内十月図, or Ten Months in the Womb, a series of illustrations circulated throughout Japan in the 18th century which shed light on the monthly development of the fetus from conception to birth. In this presentation various kinds of Tainai totsuki zu will be used to examine how the Japanese perceived the female body and fetus during pregnancy. In order to make clear how these perceptions evolved over time, the paper will make comparisons with similar illustrations from the 20th century, by which time images of fetal development were based on Western biomedical science.