胚层

They are bilateral symmetrical animals with a triploblastic body plan.

它们是三胚层体制两侧对称。

Two cell layers (diploblastic) separated by a gelatinous mesoglea.

两层细胞(两胚层)，中间是凝胶状中胶层。

The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm.

原始口（或口凹）是外胚层表面一个轻微凹陷。

Bone marrow mesenchymal stem cell(BM-MSC)is a early stem cell from the development of mesoblastema.

骨髓间充质细胞(BM-MSC)是一种来自中胚层早期细胞。

Dentinogenesis imperfecta (DI) is a kind of mesodermal defect inherited in a simple autosomal dominant mode.

本质形成不良是一种体染色体显性遗传中胚层缺陷。

Ectodermal dysplasia appears in two froms, hidrotic and anhidrotic, according to clinical features and hereditary characteristics.

外胚层异常症，依照临床表徵及遗传特性，可分成无汗型与出汗型两大类。

In the embryo an undifferentiated mesodermal component of an early trunk or tail segment or metamere, derived from paraxial mesoderm.

在胚胎时，一个无法区别中胚层组成一个早期躯、或尾部片段或体节，衍生自轴旁中胚层。

Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.

外胚层表面呈双边卵圆形增厚形成鼻板，然后展成为额鼻隆起下半部分。