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，从枝主枝延伸出来
小枝，都从枝
叫做「小枝
」
层细胞长出来。
)
小支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，从枝主枝延伸出来小枝，都从枝叫做「小枝」层细胞长出来。
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