splanchnocranium

noun
splanch·​no·​cra·​ni·​um | \ˌsplaŋk-nō-ˈkrā-nē-əm \
plural splanchnocraniums or splanchnocrania\-​nē-​ə \

Medical Definition of splanchnocranium 

: the portion of the skull that arises from the first three branchial arches and forms the supporting structure of the jaws

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