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A notochord is a flexible, rod-like structure found in the embryos of all chordates, including vertebrates. It serves as a primary skeletal support, providing structural integrity and helping in the development of the spine. In most vertebrates, the notochord is eventually replaced by the vertebral column (spine) during development, but it plays a crucial role in early embryonic development and signaling. The presence of a notochord is one of the defining characteristics of the phylum Chordata.
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