kyun4(英語:zygomatic arch)是合弓綱脊椎動物面部兩側的一種拱橋骨骼特徵,在外耳道前方向前延伸到面部側前。顳弓由顴骨的顳突和顳骨的顴突聯合構成,與顴骨和顳骨主體之間形成的空隙就是顳顬孔顳肌穿過其中。顴弓的弓度決定了面部的寬度,弓度越大越向外側突出,面部越寬。顴弓的弓度因種族差異而明顯不同,東方民族顴弓弓度較大,而西方阿利安人種則較小。

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