배아(Streeter 연령군 ⅩⅧ)의 1예

Abstract

A human embryo that was obtained from the tubal pregnancy is described. It was serially sectioned and was reconstructed with the 1028 section slides. The length of the embryo was 15mm. This embryo was chracterized by the formation of the vomeronasal organ , marked pigmentation of retina. loss of lens vesicle , three semicircular ducts at the inner eaf, cup shaped semilunar valves , completion of the subsegmental bronchus and the further division in the lung, formation of the Mullerian duct and initia' tion of the differentiation of the gonad. From above findings, we concluded that this embryo belonged to age group XVIII of Streeters develop· mental horizon