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The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop. 中胚層中間胚芽層，位于外胚層和內(nèi)胚層之間，最終發(fā)育成結(jié)締組織、肌肉、。
During gestation day 17, certain amount of somatostatin cells were observed in the decidua parietalis and in the embryonic connective tissue below the placental chorionic epithelium. 妊娠晚期壁蛻膜和胎盤絨毛膜上皮下方胚性結(jié)締組織，含有相當(dāng)數(shù)量生長抑素陽性細(xì)胞。