chondrocranium

[ kon-droh-krey-nee-uhm ]

/ ˌkɒn droʊˈkreɪ ni əm /

a braincase composed of cartilage rather than bone, as the skull of sharks and of the vertebrate embryo before ossification.

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What does “Indigenous” mean?

First recorded in 1870–75; chondr(i)o- + cranium

The mandibles, however, are in part derived from the chondrocranium.
Degeneracy|Eugene S. Talbot
In the sturgeon the chondrocranium is ensheathed by numerous membrane bones, but cartilage bones are absent.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3|Various
The chondrocranium, jaws, arches, and muscles of a partly grown larva.
The Ancestry of Modern Amphibia: A Review of the Evidence|Theodore H. Eaton
Numerous membrane bones cover the chondrocranium externally.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3|Various

These two conditions result from the inability of the dermal bones to fill at the proper period the gaps in the chondrocranium.
Degeneracy|Eugene S. Talbot

chondrocranium

[ kŏn′drō-krā′nē-əm ]

The cartilaginous parts of the developing skull.