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
的小枝，都从枝脊表面叫做「小枝板」的单层细胞长。
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，从枝主枝延的小枝，都从枝脊表面叫做「小枝板」的单层细胞长。
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