这个词是什么意思？
The two longitudinal ridges along the PRIMITIVE STREAK appearing near the end of GASTRULATION during development of nervous system (NEURULATION). The ridges are formed by folding of NEURAL PLATE. Between the ridges is a neural groove which deepens as the fold become elevated. When the folds meet at midline, the groove becomes a closed tube, the NEURAL TUBE.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009432 · MeSH 2026。
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