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.
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.
结果：(1)骨原始神经外胚层肿瘤来源于神经嵴的胚胎迁移细胞。
Results: (1) Osseous PNET originated from embryonic migrating cells of neural crest.
神经内分泌肿瘤是指具有分泌颗粒细胞的肿瘤，起源于神经外胚层。
Neuroendocrine tumours are tumours of cells which possess secretory granules and originate from the neuroectoderm.
神经内分泌肿瘤是指携带分泌颗粒的细胞肿瘤，起源于神经外胚层。
Neuroendocrine tumours are tumours of cells, which possess secretory granules and originate from the neuroectoderm.
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.
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.
室管膜囊肿被认为起源于神经外胚层的内陷，囊肿覆盖以柱状和立方上皮细胞。
Ependymal cysts are thought to originate from invagination of neuroectoderm, and the cysts are lined with either cuboid or columnar epithelium.
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.
目的探讨幕上原始神经外胚层肿瘤的临床特点、影像学特征、综合治疗方法及对预后影响。
Objective To analyze the clinical features, neuroimaging presentations, and treatment and prognosis of supratentorial primitive neuroectodemal tumors.
材料与方法：对2例骨原始神经外胚层肿瘤的临床表现、影像特征进行描述，并结合文献分析。
Materials and Methods: The clinical findings and the imaging features of 2 cases with osseous PNEI were described and analyzed.
在脊椎动物胚胎的早期发育中，多种信号途径对中胚层形成和神经外胚层分化起着重要的调节作用。
Many signaling pathways play important roles in the formation of mesoderm and patterning of the neuroectoderm during early development of vertebrate embryos.
囊肿的起源尚不清楚，但是它们被认为是起源于神经外胚层的内陷，囊肿壁覆盖以柱状或立方上皮细胞。
The origin of the cysts is unknown, but they are thought to originate from invagination of neuroectoderm, and the cysts are lined with either cuboid or columnar epithelium.
结果神经鞘瘤14例，神经纤维瘤5例，恶性周围性神经鞘瘤（MP NST） 5例，原始神经外胚层瘤1例。
Results There were 14 schwannomas, 5 neurofibromas, 5 malignant peripheral nerve sheath tumors(MPNST), and 1 peripheral primitive neuroectodermal tumor.
方法分析经手术病理证实的9例原始神经外胚层肿瘤的MRI表现，其中男6例，女3例，平均年龄32 6岁。
Methods MRI manifestations of 9 PNET diagnosed via operation and pathological examination were analyzed. There were 6 men and 3 women, and the mean age was 32.6 years.
在外胚层，神经管正在形成，在此基础上，婴儿的神经系统——大脑、脊髓、皮肤和毛发——将会形成。
In the outer layer (ectoderm) the neural tube is forming from which the baby's nervous system-brain spinal cord skin and hair-will develop.
在外胚层，神经管正在形成，在此基础上，婴儿的神经系统——大脑、脊髓、皮肤和毛发——将会形成。
In the outer layer (ectoderm) the neural tube is forming, from which the baby's nervous system-brain, spinal cord, skin and hair-will develop.
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.
结果正常同窝鼠，胎龄13天（ED13）来源于外胚层神经嵴的神经母细胞迁移并进驻胃壁；
Results In normal littermates, the precursor cells from the neural crest migrated into stomach at ED13.
结果正常同窝鼠，胎龄13天（ED13）来源于外胚层神经嵴的神经母细胞迁移并进驻胃壁；
Results In normal littermates, the precursor cells from the neural crest migrated into stomach at ED13.
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