has part has part has_part characteristic of has modifier abnormal parietal bone morphology small parietal bone reduced size of the paired membranous bones located between the frontal and occipital bones that are large, curved and quadrilateral in outline, articulate with each other at the midline in the sagittal suture, and form most of the superior and lateral aspects of the cranium reduced parietal bone size decreased parietal bone size small parietal bones MP:0004418 MPheno.ontology abnormal decreased size tetrapod parietal bone