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
出来的小，都从脊表面叫做「小板」的单层细胞长出来。
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，从主出来的小，都从脊表面叫做「小板」的单层细胞长出来。
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