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，
枝主枝延伸出来的小枝，
枝脊表面叫做「小枝板」的单层
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，枝主枝延伸出来的小枝，枝脊表面叫做「小枝板」的单层出来。
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