外胚层遵循一个默认的路径。
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
它由星形细胞瘤，少突胶质细胞瘤，室管膜瘤发展而来，它们是由神经外胚层细胞诱导的。
It developed from astrocytoma, oligodendroglioma, ependymoma, which were induced by neural ectoblast.
在中胚层，心脏和循环系统正在形成。
In the center layer (mesoderm), the heart and circulatory system are forming.
在中胚层，心脏和循环系统正在形成。
In the center layer (mesoderm) the heart and circulatory system are forming.
最终诊断为先天性中胚层肾瘤。
成纤维细胞是胚胎中胚层起源的间叶细胞。
Fibroblasts are mesenchymal cells which are derived from the embryonic mesoderm.
两层细胞（两胚层），中间是凝胶状的中胶层。
Two cell layers (diploblastic) separated by a gelatinous mesoglea.
发育8天后，老鼠早期胚胎的，外胚层开始增厚。
This surface layer thickens at an early stage in a mouse after 8 days of development.
剥离牛胚胎滋胚层细胞，ICM细胞更易分化。
When the trophoblast were removed, ICM cell would be differentiate rapidly.
在外胚层的凹陷和增厚过程中,表达了很多基因。
there are many genes that are already expressed and presented in this dimpling and thickening of the outer layer.
这表明胚层之间的界限并不是我们胰腺想想的那样严格。
This suggests germ layer boundaries are less absolute than previously thought.
中胚层产生以后，滋养层细胞由单层扁平变成单层柱状；
After the mesodermblast formation the trophoblast changed from flat cells to cubic cells.
“胖型体质者”或“内胚层体型者”则处于这两类人之间。
肝脏由胚胎内胚层演变而来，胚胎期肝具有重要的造血功能。
Liver origins from endoderm and is an important hematopoietic organ in embryo.
芝麻籽大小的小蝌蚪现在已经分成了三层：外胚层、中胚层和内胚层。
The little tadpole about the size of a sesame seed is now made up of three layers: the ectoderm mesoderm and endoderm.
芝麻籽大小的小蝌蚪现在已经分成了三层：外胚层、中胚层和内胚层。
The little tadpole, about the size of a sesame seed, is now made up of three layers: the ectoderm, mesoderm and endoderm.
目的探讨原始神经外胚层瘤（PNET）的病理学特点及其临床意义。
Objective To study the pathological characteristics of primitive neuroectodermal tumor(PNET) of bone and soft tissue.
这些表皮细胞在胚胎学上把源于支气管生长过程中的前内脏叫内胚层。
These epithelial elements arise embryologically from foregut endoderm in the process of bronchial tubular growth.
第一个鉴别诊断是卵巢甲状腺肿，为卵巢单胚层畸胎瘤，通常呈囊性。
The first differential diagnosis has to be struma ovarii, which is a monodermal ovarian teratoma that is usually cystic.
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.
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.
结果肿瘤含有横纹肌样细胞、原始神经外胚层、上皮及间叶多向分化成分。
Results The tumor containing rhabdoid cells, variable components of primitive neuroectodermal, epithelial and mesenchymal components.
脊椎动物胚胎中胚层中的体节物质，沿脊索成对出现，后生长成肌肉或脊椎。
A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.
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.
随着年龄的增长，男孩体型变化较小，大多属中胚层体型，女孩体型变化较大。
The boy somatotype changed a little, while the girls changed in large extent with age.
结果提示：视网膜母细胞瘤来源于神经外胚层上皮，向神经元和光感受器方向分化。
The results suggested that retinoblastoma originated from the retinoblast with potential of differentiation into photoreceptors and neurons.
结果提示：视网膜母细胞瘤来源于神经外胚层上皮，向神经元和光感受器方向分化。
The results suggested that retinoblastoma originated from the retinoblast with potential of differentiation into photoreceptors and neurons.
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