| 单词 | 外胚层 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔body wall〕The portion of an animal body that consists of ectoderm and mesoderm, forms the external body surface, and encloses the body cavity.体壁：动物躯体的一部分，由外胚层和内胚层组成，形成围绕体腔的外部体表美国传统〔diploblastic〕Derived from two embryonic germ layers, the ectoderm and the endoderm. Used of lower invertebrates, such as sponges and coelenterates.双胚层的：具有两个胚层（外胚层和内胚层）的。用于低等无脊椎动物，如寄生虫和腔肠动物美国传统〔ectoderm〕The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and, in vertebrates, sense organs develop.外胚层：胚胎最初三层胚层中的最外一层，由此发育成为表皮、神经组织和脊椎动物的感觉器官美国传统〔ectomere〕Any of the blastomeres from which the ectoderm develops.外裂球：任一种发育成外胚层的裂球美国传统〔epiblast〕The outer layer of a blastula that gives rise to the ectoderm after gastrulation.外胚层：囊胚的外层，在原肠胚形成之后生后外胚层组织美国传统〔epidermis〕The outermost layer of cells covering the leaves and young parts of a plant.外胚层：覆盖于植物叶面和萌芽之上的最外一层细胞美国传统〔neural crest〕The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia.神经脊：脊椎动物胚胎外胚层的一部分。位于神经管的两侧，并逐步发展成头颅神经元、脊髓神经元、自主神经系统神经元美国传统〔neural plate〕The thickened dorsal plate of ectoderm that differentiates into the neural tube and neural crest.神经板：外胚层的厚脊板，它最终分化成神经管和神经脊美国传统〔somatotype〕The structure or build of a person, especially to the extent to which it exhibits the characteristics of an ectomorph, an endomorph, or a mesomorph.体型：人体的结构或体格，尤其指展示其作为外胚层体型者、内胚层体型者或中胚层体型者特征意义而言者美国传统 |
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