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.
正上,枝以螺旋形绕著状的芽生长,的一侧接一起形,同时的另一侧形新的枝脊。
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.
正上,枝以螺旋形绕著状的芽生长,的一侧接一起形,同时的另一侧形新的枝脊。
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