额骨[frontalbone]是颅前上部的一对膜化骨，组成颅骨的29块骨头之一。位于前额处，后上方紧接着顶骨，在人类头上联合成单个骨。
收藏者支付数千美元为了鲨鱼下额骨。
Collectors pay thousands of dollars for the jawbones of a shark.
包括更厚实强壮的额骨、颊骨、颚骨和颈椎骨。
These include thicker, stronger bones in the forehead, cheeks, jaw and neck.
最常见于额骨和顶骨，眶骨和上颌骨很少受累。
These are most frequently seen in the frontal and parietal bones with the orbital and maxillofacial bones infrequently involved.
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