cranial segment

noun

Definition of cranial segment 

: any of three annular segments into which the bones of the cranium proper may be grouped:

a : an occipital segment consisting of the basioccipital, exoccipital, and supraoccipital bones

b : a parietal segment consisting of the basisphenoid, alisphenoid, and parietal bones

c : a frontal segment consisting of the presphenoid, orbitosphenoid, and frontal bones

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