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
以螺旋形绕著
状的羽芽生
，子的一侧接合一起形成羽轴，
时子的另一侧形成新的羽
。
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，羽以螺旋形绕著状的羽芽生，子的一侧接合一起形成羽轴，时子的另一侧形成新的羽。
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