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南方鲶的颌齿均由外胚层及中胚层分化而成。The jaw teeth and pharyngeal teeth are derived from the ectoderm and mesoderm.

这跟他自己是同质性，跟随他的外胚层与内胚层延续下去。This is homogeneous with himself and in continuity with his ectoderm and his endoderm.

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在最新研究中，钟江团队使用的人体皮肤细胞则同由外胚层形成的大脑和神经细胞有关。In its study, Zhong's team examined human skin cells, which are related to brain and neural cells from the ectoderm.

这是在神经胚形成期，皮肤外胚层从神经外胚层分离不完全所致。It is the result of incomplete disjunction of the cutaneous ectoderm from neural ectoderm during the process of neurulation.

在外胚层和内胚层之间是中胚层，它形成肌肉、生殖腺、血管和排泄器官。Between the ectoderm and endoderm is mesoderm, which forms the muscles, reproductive organs, blood vessels and excretory organs.

大家知道，耳朵发育的早期特征,是胚胎外层膜的增厚，这层膜也叫外胚层。We can see the early signs of ear development Start with the thickening of the outer layer of the embryo, this layer is called the ectoderm.

一旦撤除分化抑制因素，或添加适当的诱导剂，ES细胞可分化为内胚层、中胚层和外胚层的多种类型的特化细胞。Under appropriate conditions embryonic stem cells have been shown to differentiate in vitro to multiple cell types of endoderm, mesoderm and ectoderm.

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用冰冻蚀刻和超薄切片的方法研究了蝾螈早期原肠胚外胚层细胞间的细胞连接。Cell junctions of the presumptive ectoderm cells of early gastrula of Cynops orientalis were studied with freeze-etching method and ultrathin sectioning.

外胚层形成皮肤和神经系统、内胚层形成内脏器官例如肝脏、胰腺、胸腺，中胚层则形成肌肉、骨骼和血液。Ectoderm becomes skin and nerves, endoderm becomes the gut and organs such as the liver, pancreas and thymus, and mesoderm becomes muscle, bones and blood.

残留细胞注射部位形成畸胎瘤，瘤体组织中存在成熟的内胚层、中胚层和外胚层组织。The residual cells were able to form teratoma at the injection site, and mature endoderm, mesoderm and ectoderm tissues could be found in teratoma tissues.

颅骨脊椎动物中一层复杂的胚体细胞，由部分中胚层及外胚层联合组成，形成身体内壁。A complex sheet of embryonic cells in craniate vertebrates, formed by association of part of the mesoderm with the ectoderm and developing as the internal body wall.

中胚层中间胚芽层，位于外胚层和内胚层之间，最终发育成结缔组织、肌肉、。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.

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结论涎腺肿瘤可能起源于涎腺闰管的基底细胞，该基底细胞可能与神经外胚层关系密切。Conclusion It is suggested from the present study that the salivary gland tumors may originate from basal cells of intercalary ducts and this cell may closely relate with neural ectoderm.