ectoderm

简明释义

英[ˈektəʊˌdɜːm]美[ˈektəˌdɜːrm]

n. 外胚层，外细胞层

英英释义

单词用法

同义词

反义词

例句

1.We discovered that CAM ec on day 8, 10, and 12 after incubation localized beneath the chorionic ectoderm, but with the age growing, ec gradually migrated toward ectoderm from mesenchyme.

发现鸡胚在第8、10、12天胚龄时CAMEC都位于外胚层绒毛膜上皮之下，随胚龄增大，EC逐渐由中胚层移向外胚层。

2.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。

3.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.

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、骨骼、泌尿系统及循环系统。

4.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。

5.Derived from two embryonic germ layers, the ectoderm and the endoderm.

双胚层的具有两个胚层（外胚层和内胚层）的。

6.Between the ectoderm and endoderm is mesoderm, which forms the muscles, reproductive organs, blood vessels and excretory organs.

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。

7.It is the result of incomplete disjunction of the cutaneous ectoderm from neural ectoderm during the process of neurulation.

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。

8.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.

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。

9.The ectoderm gives rise to structures such as hair, nails, and the lens of the eye.

外胚层产生的结构包括头发、指甲和眼睛的晶状体。

10.In some animals, the regeneration of limbs involves the manipulation of ectoderm cells.

在一些动物中，肢体再生涉及对外胚层细胞的操控。

11.Researchers study the ectoderm to understand the development of neural tissues.

研究人员研究外胚层以了解神经组织的发展。

12.The outer layer of the embryo develops into the ectoderm, which is responsible for forming the skin and nervous system.

胚胎的外层发育成外胚层，负责形成皮肤和神经系统。

13.During gastrulation, cells migrate to form the three primary germ layers, including the ectoderm.

在原肠胚形成过程中，细胞迁移形成三个主要胚层，包括外胚层。

作文

The development of an organism is a fascinating process that involves multiple stages and layers. One of the primary layers formed during embryonic development is the ectoderm, which plays a crucial role in the formation of various structures in the body. The ectoderm (外胚层) is the outermost layer of the three primary germ layers: the ectoderm, mesoderm, and endoderm. Each of these layers contributes to different systems and tissues within an organism. In the early stages of embryogenesis, the ectoderm is responsible for developing into several key components of the body. It gives rise to the skin, hair, nails, and the entire nervous system. This includes the brain and spinal cord, making the ectoderm essential for proper neurological function and protection of the internal organs. The role of the ectoderm extends beyond just structural elements; it also plays an important part in sensory functions. For example, the outer layer of the skin contains sensory receptors that allow organisms to interact with their environment. Moreover, the ectoderm is involved in the development of glands, such as sweat glands and mammary glands, which are vital for thermoregulation and lactation, respectively. The complexity of the ectoderm showcases its importance in both the physical and functional aspects of an organism. Understanding the ectoderm is not only essential for biology students but also for medical professionals. Abnormalities in the development of the ectoderm can lead to various congenital disorders. For instance, conditions like spina bifida or anencephaly arise from improper closure of the neural tube, a structure derived from the ectoderm. These conditions highlight the significance of the ectoderm in ensuring normal development and function. Research in developmental biology continues to reveal more about the mechanisms governing ectoderm formation and differentiation. Scientists use model organisms, such as zebrafish and mice, to study how the ectoderm interacts with other germ layers and what factors influence its development. Such studies can lead to advancements in regenerative medicine and tissue engineering, where understanding how to manipulate the ectoderm could enable scientists to create skin grafts or even nerve tissue for patients with injuries. In conclusion, the ectoderm (外胚层) is a fundamental component of embryonic development that contributes to many vital systems in the body. Its roles in forming the nervous system, skin, and glands demonstrate its importance in both structure and function. As research progresses, our understanding of the ectoderm will continue to grow, potentially leading to innovative medical treatments and therapies. Thus, grasping the concept of the ectoderm is essential for anyone interested in the fields of biology and medicine.