In both types of feather, the barbules that extend from the barb ramus grow from a single layer of cells, called the barbule plate, on the periphery of the barb ridge.
而不论是何种
毛，从枝主枝延伸出
枝，都从枝脊表面叫做「枝板」单层细胞长出。
)
支In both types of feather, the barbules that extend from the barb ramus grow from a single layer of cells, called the barbule plate, on the periphery of the barb ridge.
而不论是何种毛，从枝主枝延伸出枝，都从枝脊表面叫做「枝板」单层细胞长出。
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