Metopism

Medical condition

Metopism is the condition of having a persistent metopic suture, or persistence of the frontal metopic suture in the adult human skull. Metopism is the opposite of craniosynostosis. The main factor of the metopic suture is to increase the volume of the anterior cranial fossa. The frontal bone includes the forehead, and the roofs of the orbits of the eyes. The frontal bone has vertical portion (squama) and horizontal portion. Some adults have a metopic or frontal suture in the vertical portion. In uterine period in right and left half of frontal region of the fetus there is a membrane tissue. On each half a primary ossification center appears about the end of the second month of the fetus. Primary ossification center extends to form the corresponding half of the vertical part (squama) and horizontal part of the frontal bone.

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