叉骨

鳥類的左右鎖骨以及退化的間鎖骨在腹中線處癒合成“V”形，稱為叉骨（wishbone)，是鳥類特有的結構。

鳥類肩帶中特有的骨骼.由左右鎖骨及退化的間鎖骨在腹中線處癒合成“Ｖ”形.兩側的骨棒細長而稍曲，近端扁寬，接近烏喙骨突處以韌帶與肩臼連線.兩側遠端斜向內下方延伸，在接近胸骨中線處癒合成扁平的突起（見圖）。叉骨叉骨堅實而富有彈性，在鳥翼劇烈搧動時可避免左右烏喙骨向中間靠近發生碰撞、擠壓氣管，並增加肩帶彈性.無飛翔能力的鴕鳥等平胸總目鳥類，叉骨退化成為烏喙骨的一部分.相 關 詞 條:始祖鳥 |GOOGLE英文翻譯:Shoulder strap in the bones of birds unique. From the left clavicle and the degradation of the inter-clavicular line at the belly of healing into a "V" shape. On both sides of the bone and the slightly elongated rod song, proximal bian wide, near the Ukrainian beak bone suddenly imposed acetabular ligament and the shoulder connection. on both sides of the bottom of the remote inclined extension of the sternum near the midline healing into the flat and protruding (see figure). wishbone wishbone firm and elastic, in the bird wing flap can be avoided sharp beak bones about Ukraine closer to the middle of a collision, squeeze the trachea, and increase flexibility in shoulder strap. Ostriches and other non-flying capacity of Head of birds Platysternon , forks and bone degradation, bone beak to become a part of Ukraine. Related term: archeopteryx |