You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
你看，成年雌鸟在产蛋的过程中会在某些长骨内产生一层海绵状的骨组织。
An external layer of compact Bone surrounds a central area of spongy Bone, except at the marrow cavity.
骨的外层为质密的骨皮质，包围着海绵状骨松质中心区（不算骨髓腔）。
Results: mandibular canal was formed by a thin layer of compact bone in spongy bone of mandibular bone.
结果：下颌管是下颌骨的骨松质内形成较薄的骨密质骨管。
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