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,羽枝以螺旋形绕著羽芽生长,在子一侧接合在一形羽轴,同时在子另一侧形羽枝脊。
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,羽枝以螺旋形绕著羽芽生长,在子一侧接合在一形羽轴,同时在子另一侧形羽枝脊。
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