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，
主延伸出来的小，都脊表面叫做「小板」的单层细胞长出来。
的)
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，主延伸出来的小，都脊表面叫做「小板」的单层细胞长出来。
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