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单词 notochord
释义

Definition of notochord in English:

notochord

noun ˈnəʊtə(ʊ)kɔːdˈnōdəˌkôrd
Zoology
  • A cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.

    〔动〕脊索

    Example sentencesExamples
    • They all have, at some embryonic stage, a notochord, flanked by muscle, and a dorsal neural tube.
    • In the evolution of vertebrates, long bodies with continuously flexible notochords and segmental muscles existed before the appearance of segmental vertebrae.
    • Moreover, these ectopic neural tubes were patterned appropriately with respect to the notochord and dorsal ectoderm.
    • In those chordates which lack bone, muscles work against the notochord to move the animal.
    • Let us review the fundamental features of the vertebrate body as context for notochords and backbones.

Origin

Mid 19th century: from Greek nōton 'back' + chord2.

Definition of notochord in US English:

notochord

nounˈnōdəˌkôrd
Zoology
  • A cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.

    〔动〕脊索

    Example sentencesExamples
    • Let us review the fundamental features of the vertebrate body as context for notochords and backbones.
    • They all have, at some embryonic stage, a notochord, flanked by muscle, and a dorsal neural tube.
    • In those chordates which lack bone, muscles work against the notochord to move the animal.
    • Moreover, these ectopic neural tubes were patterned appropriately with respect to the notochord and dorsal ectoderm.
    • In the evolution of vertebrates, long bodies with continuously flexible notochords and segmental muscles existed before the appearance of segmental vertebrae.

Origin

Mid 19th century: from Greek nōton ‘back’ + chord.

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更新时间:2024/11/9 0:44:28