| 41. | The notochord extends from the base of the head to the tail; with it extend thick bands of paraxial mesoderm.
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| 42. | The communication between the neural plate and the notochord is important for the future induction and formation of the neural tube.
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| 43. | Neurulation is the development of the nervous system in the vertebrates, at the thickened area above the notochord in ectoderms.
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| 44. | In mice, the Brachyury gene is expressed in early mesoderm cells and its expression then becomes restricted to the notochord.
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| 45. | Instead there should be a tough, rubbery cartilage there, and the spinal chord should be more like a notochord.
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| 46. | The ventral neural tube is patterned by Sonic Hedgehog ( Shh ) from the notochord, which acts as the inducing tissue.
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| 47. | The notochord is retained, and the animals, mostly under 1 cm long, are propelled by undulations of the tail.
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| 48. | Kovalevsky discovered that tunicates were not molluscs, but that their larval stage had a notochord and pharyngeal slits, like vertebrates.
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| 49. | "Metaspriggina " also possessed a notochord, along with seven pairs of pharyngeal bars, possibly made of cartilage.
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| 50. | Amphicoelous centra often are integrated with a full notochord . " Procoelous " vertebrae are anteriorly concave and posteriorly convex.
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