the def for floor plate states:
def: "Multi-tissue structure that is the ventral-most aspect of the developing neural tube. The floor plate is a specialized glial structure that spans the rostral-caudal axis from the midbrain to the tail regions." [ZFIN:curator]
This suggests that this is part of the NT ("aspect" is vague). However, there is a separate term "FP NT" which starts after the FP has started:
ZFA:0000022 ! floor plate [part_of: "central nervous system"] [start: "Segmentation:5-9 somites"]
ZFA:0001434 ! floor plate neural tube [part_of: "floor plate"] [part_of: "neural tube"] [start: "Segmentation:14-19 somites"]
also, there is an exact syn for FP:
synonym: "flexural organ" EXACT 
I thought the flexural organ was the most rostral part of the FP? E.g.
Maybe this deserves its own term? Or maybe at least a demotion from exact syn.
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