这个词是什么意思？
A cartilaginous rod of mesodermal cells at the dorsal midline of all CHORDATE embryos. In lower vertebrates, notochord is the backbone of support. In the higher vertebrates, notochord is a transient structure, and segments of the vertebral column will develop around it. Notochord is also a source of midline signals that pattern surrounding tissues including the NEURAL TUBE development.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009672 · MeSH 2026。
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