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What is the formation of amphibian primary neuroembryo? What are the five stages?
1 means that the primary chordal mesoderm induces the ectodermal cells covering it to divide, invaginate and separate from the epidermis, forming a hollow neural tube.

2. These periods are neural plate formation period, neural base formation period, neural plate formation period, neural plate bending period and neural groove closure period. According to relevant published data, most amphibians belong to primary neuroembryogenesis, and only the caudal neural tube is produced by secondary neuroembryogenesis. According to relevant public information, amphibian primary nerves mainly exist in mammals.