notochordal

简明释义

英[nəʊtəʊˈkɔːdəl]美[noʊtəˈkɔrdəl]

脊索的

英英释义

单词用法

同义词

反义词

例句

1.Chordomas are rare tumors of notochordal tissue remnants and most frequently affect the sacrum and skull base.

脊索瘤是来自脊索遗迹的罕见肿瘤，主要侵犯荐椎及颅底。

2.Chordomas are rare tumors of notochordal tissue remnants and most frequently affect the sacrum and skull base.

脊索瘤是来自脊索遗迹的罕见肿瘤，主要侵犯荐椎及颅底。

3.New notochordal cell populations were seen in degenerated discs injected with ESCs.

行胚胎干细胞注射的退变椎间盘中出现了新生脊索细胞群。

4.In vertebrates, the notochordal 脊索的 structure serves as a precursor to the vertebral column.

在脊椎动物中，notochordal 脊索的结构作为脊柱的前体。

5.The development of the spine is closely linked to the presence of the notochordal 脊索的 structure during embryogenesis.

脊柱的发展与胚胎发育过程中存在的notochordal 脊索的结构密切相关。

6.The presence of a notochordal 脊索的 rod is essential for proper axial skeleton formation.

存在notochordal 脊索的棒状结构对于正确的轴性骨骼形成至关重要。

7.Researchers are studying the notochordal 脊索的 cells to understand their role in spinal cord regeneration.

研究人员正在研究notochordal 脊索的细胞，以了解它们在脊髓再生中的作用。

8.During the evolution of chordates, the notochordal 脊索的 feature has been preserved across many species.

在脊索动物的进化过程中，notochordal 脊索的特征在许多物种中得以保留。

作文

The study of embryology reveals many fascinating aspects of vertebrate development, one of which is the role of the notochord. The notochord is a flexible rod-like structure that serves as a primary axial support in the early stages of vertebrate embryos. It plays a crucial role in the development of the nervous system and the skeletal structure. The presence of the notochord is one of the defining characteristics of chordates, a phylum that includes not only vertebrates but also some invertebrates. As the embryo develops, the notochord provides signals that guide the formation of surrounding tissues, particularly in the development of the neural tube, which eventually becomes the spinal cord.In addition to its structural role, the notochord is instrumental in the process of organogenesis. It influences the differentiation of various cell types, including those that form muscles and bones. The interactions between the notochord and adjacent tissues are vital for proper anatomical organization. For instance, in many species, the cells that will become vertebrae arise from regions adjacent to the notochord, highlighting its importance in shaping the vertebral column.Interestingly, although the notochord is prominent during early development, it often undergoes significant changes as the organism matures. In many vertebrates, the notochord is replaced by the vertebral column, a series of bony structures that provide more rigid support and protection for the spinal cord. This transformation is a remarkable example of how developmental processes can lead to significant morphological changes over time.The evolutionary significance of the notochord cannot be overstated. It is believed that the presence of the notochord in early chordates was a key factor that allowed these organisms to evolve more complex structures. The flexibility of the notochord may have provided an advantage in locomotion, enabling early vertebrates to explore new ecological niches. Furthermore, the notochord has been preserved throughout evolution, serving as a reminder of our shared ancestry with other chordates.In conclusion, the notochord is a vital component in the development of vertebrates, influencing not only structural formation but also the intricate processes of organogenesis and tissue differentiation. Its evolutionary implications highlight the significance of this simple yet essential structure in the grand tapestry of life. Understanding the role of the notochord enriches our knowledge of biology and underscores the interconnectedness of all living organisms. As we continue to study the complexities of embryonic development, the notochord remains a symbol of the marvels of nature and the intricate dance of life that unfolds from a single cell into a fully formed organism.

胚胎学的研究揭示了脊椎动物发育的许多迷人方面，其中之一是脊索的作用。脊索是一个柔韧的棒状结构，在脊椎动物胚胎的早期阶段作为主要的轴向支撑。它在神经系统和骨骼结构的发展中扮演着至关重要的角色。脊索的存在是脊索动物门的一个定义特征，这个门不仅包括脊椎动物，还包括一些无脊椎动物。在胚胎发育过程中，脊索提供信号，引导周围组织的形成，特别是在神经管的发展中，神经管最终将成为脊髓。除了结构作用外，脊索在器官发生过程中也起着重要作用。它影响各种细胞类型的分化，包括形成肌肉和骨骼的细胞。脊索与邻近组织之间的相互作用对正确的解剖组织至关重要。例如，在许多物种中，将成为椎骨的细胞来自于邻近脊索的区域，这突显了其在塑造脊柱中的重要性。有趣的是，尽管脊索在早期发育中显著存在，但随着生物体的成熟，它通常会经历重大变化。在许多脊椎动物中，脊索被脊柱取代，脊柱是一系列骨性结构，为脊髓提供更刚性的支撑和保护。这一转变是发育过程如何随时间推移导致显著形态变化的一个令人瞩目的例子。脊索的进化意义不容小觑。人们认为，早期脊索动物中脊索的存在是这些生物能够进化出更复杂结构的关键因素。脊索的灵活性可能为运动提供了优势，使早期脊椎动物能够探索新的生态位。此外，脊索在进化过程中得以保留，提醒我们与其他脊索动物的共同祖先。总之，脊索是脊椎动物发育中的一个重要组成部分，不仅影响结构形成，还影响器官发生和组织分化的复杂过程。它的进化意义突显了这一简单而重要的结构在生命宏伟画卷中的重要性。理解脊索的作用丰富了我们对生物学的认识，并强调了所有生物体之间的相互联系。当我们继续研究胚胎发育的复杂性时，脊索仍然是自然奇迹和生命舞蹈的象征，从单个细胞展开到完全形成的生物体。