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.

而何种毛，从枝主枝延伸出来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长出来。

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，从枝主枝来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长来。

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.

而不论是毛，从枝主枝延伸出来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长出来。

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，从枝主枝延伸出来的枝，都从枝脊表面叫做「枝板」的单层细胞长出来。

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.

是何种毛，从枝主枝延伸出来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长出来。

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，从枝主枝延伸出来的小枝，都从枝脊面叫做「小枝板」的单层细胞长出来。

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，都从脊表面叫做「板」的单层细胞长。

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，从枝主枝延伸出来小枝，都从枝叫做「小枝」层细胞长出来。

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，从枝主枝延伸出来的小枝，都从枝脊面叫做「小枝板」的单层细胞长出来。