1. 额骨：幼儿的头之所以可以在出生后的头两年快速的成长又能维持漂亮的形状,主要是因为头盖骨是由5块骨头所组成,2块成对且对称的额骨(frontal bone),2块成对又对称的顶骨(parietal bones)及1块枕骨(occipital bone)所构成,这几块骨头彼此间都留存有缝隙,
2. 一一额骨：9. Illium一一骼骨 | 10. Frontal bone一一额骨 | 11. Parietal bone一一顶骨
noun
1. the large cranial bone forming the front part of the cranium: includes the upper part of the orbits
Synonym: os frontaleforehead