单词	chondrocranium
释义	chondrocranium /ˌkɒndrə(ʊ)ˈkreɪnɪəm / noun Zoology & Embryology The primary skull of vertebrates, composed of cartilage, which in humans and most other vertebrates is replaced by bone during development.The taenia tecti medialis, a bar of cartilage on the dorsomedial surface of the chondrocranium that bisects the parietal portion of the frontoparietal fontanelle, evolved in the common ancestor to neobatrachians.... In bony vertebrates, endochondral bones form from centers of ossification in the chondrocranium, although much of the braincase often remains cartilage. The epaxial muscles insert on the posterior aspect of the chondrocranium, which later ossifies into the exoccipitals and supraoccipital of the skull.
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