Type 3 is the uni-epipteric type, in which a small irregular-shaped epipteric (also called pterion ossicle, sutural or Wormian) bone was found interposing within this type of pterion (Fig.
Basically, the patterns of pterion have been classified into 4 types: spheno-parietal, fronto-temporal, stellate, and epipteric types (Seema & Mahajan).
One or more pterion ossicles or epipteric bones may appear between the sphenoidal angle of the parietal and the greater wing of the sphenoid (2,7,8).
This was also scored as PNBr and PNBl for right and left sides respectively Pterion ossicle A sutural bone (epipteric bone) (PO) inserted between the anterior inferior angle of the parietal bone and the greater wing of the sphenoid.
This bone is called pterion ossicle or Epipteric bone or flower's bone.
The pattern of bone articulation at pterion however can be varied and small epipteric bones may be present.