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.
正羽上，羽枝以螺旋形绕著管状的羽芽生长，管子的
起形成羽轴，同时管子的另形成新的羽枝脊。
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.
正羽上，羽枝以螺旋形绕著管状的羽芽生长，管子的起形成羽轴，同时管子的另形成新的羽枝脊。
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