单词	notochord
释义	notochord /ˈnəʊtə(ʊ)kɔːd / noun Zoology A cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.In those chordates which lack bone, muscles work against the notochord to move the animal.... In the evolution of vertebrates, long bodies with continuously flexible notochords and segmental muscles existed before the appearance of segmental vertebrae. They all have, at some embryonic stage, a notochord, flanked by muscle, and a dorsal neural tube. Origin Mid 19th century: from Greek nōton 'back' + chord2.
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