本文收集受精龄为６周的难免流产完整胚胎一例，连续纵切，切片厚１０μｍ，ＨＥ染色。该人胚每一巩节尾侧致密细胞群与相邻节颅侧份疏松细胞群融合成椎骨雏形。脊柱头端的节段性较尾端明显。已出现颈曲，枕软骨等与原始“ｇａｓｐ”反射有关的结构，提示受精龄６周时已有喘息的反射运动。 This collection of fertilization age of 6 weeks, one case of unavoidable abortion complete embryos, longitudinal slitting, section thickness 10μm, HE staining. The confluence of each end of the human embryonic tail dense cell group and the adjacent section of craniofacial cells loose into a fusion of vertebrae. Segments of the spine head than the tail obvious. A structure such as cervical song, occipital cartilage, and the like that is related to the original “gasp” reflex has been shown to indicate wheezing reflex movement has occurred 6 weeks after fertilization.