notochord defined in 1951 yearnotochord - notochord;
notochord - Skeletal rod (of large vacuolated cells packed within a firm sheath) lying lengthwise, between G.N.S. and gut. Present in some stage of development of all chordates. In most vertebrates occurs complete only in embryo (or larva), though remnants usually persist, between the vertebrae which replace it, in the adult. Occurs in larval and adult amphioxus, in larval tunicates, and (it is often held) is represented in adult Hemichordata.
near notochord in Knolik
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