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）。
OBJECTIVE: to investigate the efficacy of using external layer mucoperiosteum valve of thyroid cartilage to repair the wound surface and reconstruct vocal function.
目的：探讨用甲状软骨外层黏骨膜瓣修复创面并重建发声功能的效果。
OBJECTIVE: to investigate the efficacy of using external layer mucoperiosteum valve of thyroid cartilage to repair the wound surface and reconstruct vocal function.
目的：探讨用甲状软骨外层黏骨膜瓣修复创面并重建发声功能的效果。
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