The more rostral portion of the chondrocranium that lie anterior to the notochord constitutes the prechordal chondrocranium .
The more rostral portion of the chondrocranium that lie anterior to the notochord is derived primarily from neural crest - derived mesenchyme .
The more rostral portion of the chondrocranium that lie anterior to the notochord constitutes the prechordal chondrocranium , and is derived primarily from neural crest - derived mesenchyme .