- a rodlike cord of cells that forms the chief axial supporting structure of the body of the lower chordates, as amphioxus and the cyclostomes, and of the embryos of the vertebrates.
Origin of notochord
Examples from the Web for notochord
They have no backbone in the strict sense, but they have this notochord.The Outline of Science, Vol. 1 (of 4)
J. Arthur Thomson
The skeleton is completely ossified and the notochord removed.The Elements of Geology
William Harmon Norton
This structure is called the Notochord (a string down the back).
Nevertheless, traces of the notochord persist in the back-bone of these fishes.
Moreover, this rod was unsegmented, for the notochord is devoid of segmentation.The Origin of Vertebrates
Walter Holbrook Gaskell
- a fibrous longitudinal rod in all embryo and some adult chordate animals, immediately above the gut, that supports the body. It is replaced in adult vertebrates by the vertebral column
Word Origin and History for notochord
1848, coined in English by English anatomist Sir Richard Owen (1804-1892) from chord + comb. form of Greek noton "back," from PIE *not- "buttock, back" (cf. Latin natis "buttock," sopurce of Italian, Spanish nalga, Old French nache "buttock, butt").
- A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive backbone.
- A similar structure in embryos of higher vertebrates, from which the spinal column develops.
- A flexible rodlike structure that forms the main support of the body in all chordates during some stage of their development. In vertebrates, the notochord develops into a true backbone in the embryonic phase. Primitive chordates, such as lancelets and tunicates, retain a notochord throughout their lives.