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notochord

A Dictionary of Zoology

notochord (chorda dorsalis) A some what flexible, rod-like structure, composed of disc-like, turgid cells, which extends virtually the entire length of the body of adult and/or larval members of the phylum Chordata. Lying below the nerve cord, but dorsal to the intestine, the notochord provides a form of flexible support to the body. In vertebrates the notochord is replaced wholly or partly by the vertebral column, but it is retained throughout life in Cephalochordata and Agnatha.

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© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999.

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	notochord notochord (chorda dorsalis) Somewhat flexible, rod-like structure, composed of disc-like...phylum Chordata . Lying below the nerve cord, but dorsal to the intestine, the notochord provides a form of flexible support to the body. In vertebrates the notochord is replaced wholly or partly by the vertebral ... Read more
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	notochord notochord In chordates , such as acorn worms, and the early embryonic stages of vertebrates, the flexible, primitive backbone; in mature vertebrates it is replaced by the spine . Read more
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	Chordata , phylum of animals having a notochord, or dorsal stiffening rod, as the...during early development are: the notochord, composed of gelatinous tissue and...spinal cord), located above the notochord; and gill slits leading into the... Read more

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