In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.
在正羽上,羽枝以螺著管状的羽芽生长,在管子的一接在一起羽轴,同时在管子的另一新的羽枝脊。
In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.
在正羽上,羽枝以螺著管状的羽芽生长,在管子的一接在一起羽轴,同时在管子的另一新的羽枝脊。
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