正羽

覆盖 鸟类身体表面的大型羽毛.由一根长的羽轴和生长其两侧宽而薄的羽片构成（见图）。羽片又称甲羽，靠内侧的，往往被另一羽片所盖的称内甲羽，外侧的为外甲羽.羽轴向两侧平行斜伸许多羽枝，每一羽枝又向其两侧伸出许多羽小枝.每一远侧行的羽小枝的下面具有羽小钩，钩住近侧行羽小枝，这样就钩结成完整的羽片.当机械撕裂羽片时，鸟可抖动羽毛，用喙梳理完好，羽轴下段不具羽枝的部分称羽根.羽根深插入皮肤中.飞羽附着在前肢骨骼上， 尾羽附着在 尾综骨上.羽根的下端有一个开口，称下脐；羽根与羽轴连接处的腹面也有一个小的开口，称上脐，是正羽发生的遗迹.正羽构成鸟类的 体覆羽、飞羽和尾羽.正羽形态和结构示意图（ａ正羽外形ｂ正羽部分放大）M１羽轴２羽片３下脐４上脐M５羽枝６羽小枝７羽小钩M相 关 词 条:正羽 |羽毛 |动物 |Body surface covered by a large bird feathers. By a long plume axis and the growth of the pinna on both sides of wide and thin composition (see figure). Pinna is also called a feather, on the inside, often pinna are covered by another is called a plume within the medial and lateral feathers for the exoskeleton. Xieshen plume axial many feathers on both sides of the parallel branches, each feather sticks Also out on both sides of many of its feathers sprig. sprig in each distal row of the plume beneath a small hook with a feather, feather sprig hook proximal row, so that hook to form a complete pinna. When the machine when you tear pinna , bird feathers can be jitter, with beak comb intact, feather shaft lower section is not part of a feather sticks, said Hane. Haneda deep-rooted into the skin. flight feathers attached to the forelimb bones, the tail attached to the tail bone on the heald. Hane has an opening in the bottom , saying that under the navel; Hane junction with the feathers of the ventral shaft also has a small opening, saying that the navel is a positive place feather remains. are feathers underneath the body composition of birds, flight feathers and tail feathers. are feather pattern and structure of the diagram (a positive part of the feather feather shape b is larger) M1-yu 2 pinna 3-axis 4 on the umbilical cord under the M5 feather feather sprig 7 feather sticks 6 small hook M-related term: positive Feather | Feathers | Animals |正羽