a) A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine
b) A similar structure found in the embryos of vertebrates from which the spine develops

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  • Notochord — Transverse section of a chick embryo of forty five hours’ incubation. Latin notochorda Gray s …   Wikipedia

  • Notochord — No to*chord, n. [Gr. nw^ton the back + E. chord.] (Anat.) An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the… …   The Collaborative International Dictionary of English

  • Notochord — Notochord, s. Chorda dorsalis …   Meyers Großes Konversations-Lexikon

  • Notochórd — (grch.), Wirbelsaite, s. Chorda …   Kleines Konversations-Lexikon

  • notochord — (n.) 1848, coined in English by English anatomist Sir Richard Owen (1804 1892) from CHORD (Cf. chord) + comb. form of Gk. noton back, from PIE *not buttock, back (Cf. L. natis buttock, sopurce of It., Sp. nalga, O.Fr. nache buttock, butt ) …   Etymology dictionary

  • notochord — [nōt′ə kôrd΄] n. [ NOTO + CHORD1] 1. an elongated, rod shaped structure composed of cells, forming the primitive supporting axis of the body in the lowest chordates and lying between the digestive tract and the central nervous system 2. a similar …   English World dictionary

  • notochord — notochordal, adj. /noh teuh kawrd /, n. Embryol. 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. [1840 50; NOTO + …   Universalium

  • Notochord — Bauplan eines Lanzettfischchen mit Chorda dorsalis (2) zwischen dem Neuralrohr (1, 3) und dem Kiemendarm (6, 9, 11) Die Chorda dorsalis („Rückensaite“; von lat. chorda bzw. griech. chorde „Darm“, „Darmsaite“ und lat. dorsum „Rücken“), auch… …   Deutsch Wikipedia

  • notochord — the skeletal rod consisting of a sheath firmly packed with cells which lie above the gut and below the nerve cord. The notochord is persistent when it remains as a continuous skeletal support (e.g. Amphioxi, Holocephali, Acipenseridae,… …   Dictionary of ichthyology

  • notochord — noun Etymology: Greek nōton, nōtos back + Latin chorda cord more at cord Date: 1848 a longitudinal flexible rod of cells that in the lowest chordates (as a lancelet or a lamprey) and in the embryos of the higher vertebrates forms the supporting… …   New Collegiate Dictionary

  • notochord — An axial mesodermal tissue found in embryonic stages of all chordates and protochordates, often regressing as maturity is approached. Typically a rod shaped mass of vacuolated cells immediately below the nerve cord, and may provide mechanical… …   Dictionary of molecular biology

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