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
的
，
从脊表面叫做「板」的单层细胞
。
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，从主延伸的，从脊表面叫做「板」的单层细胞。
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