| 单词 | ectoderm |
| 例句 | 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〔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〔ectomorph〕An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate.瘦型体质者：由胚胎胚层发育而成的组织形成的瘦型的、肌肉不发达的人美国传统〔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〔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〔proctodeum〕An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.原肛肛道：胚胎消化道表面的凹陷，发育成直肠的一部分美国传统 |
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