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
主延伸出来
小，都从
面叫做「小板」
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，从主延伸出来小，都从面叫做「小板」细胞长出来。
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