These two conditions result from the inability of the dermal bones to fill at the proper period the gaps in the chondrocranium.
The mandibles, however, are in part derived from the chondrocranium.
Behind, the primary skull or chondrocranium gives off two occipal or rear skull plates.
In the sturgeon the chondrocranium is ensheathed by numerous membrane bones, but cartilage bones are absent.
Numerous membrane bones cover the chondrocranium externally.
In the Dipneusti36 the chondrocranium is strengthened in the adult by numerous bones.
The chondrocranium, jaws, arches, and muscles of a partly grown larva.
chondrocranium chon·dro·cra·ni·um (kŏn'drō-krā'nē-əm)
The cartilaginous parts of the developing skull.