notochord

• 脊索动物胚胎期及低等脊索动物体内的一条柔性杆状结构，位于消化道背侧，作为身体的主要轴向支撑；在高等脊椎动物中仅存于胚胎期，随后被脊柱取代。

A flexible, rod-like structure that serves as the primary axial support in the bodies of the lowest chordates and lowest vertebrates, and is also present in the embryos of higher vertebrates.

1. Flexible supporting rodC2formalscientific

   A flexible, rod-shaped structure that forms the primary axial support in the bodies of chordates, including the embryos of vertebrates.

   柔韧的支撑杆

   • The notochord is a defining feature of the phylum Chordata.
   • In vertebrate embryos, the notochord is eventually replaced by the vertebral column.
   • The notochord provides structural support and serves as a signaling center during development.