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Metopism
Metopism is the condition of having a persistent metopic suture,〔(【引用サイトリンク】title=Metopism Medical Definition - Merriam-Webster Medical Dictionary )〕 or persistence of the frontal metopic suture in the adult human skull.〔(【引用サイトリンク】title=Metopism -- Medical Definition )〕 The premature fusion of cranial sutures named craniosynostosis, it is “simple” when only one cranial suture is involved and “compound” when two or more cranial sutures are involved. Metopism is a kind of craniosynostosis.〔(【引用サイトリンク】title=Craniosynostosis )〕 The main factor of metopic synostosis is to increase the volume of the anterior cranial fossa. The frontal bone includes the forehead, and the roofs of the orbits (bony sockets) of the eyes. The frontal bone has vertical portion (squama) and horizontal portion (orbital part). Some adults have a metopic or frontal suture in the vertical portion.〔(【引用サイトリンク】title=Frontal bone )〕 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 (orbital part) of the frontal bone.
At birth the frontal bone contains two portions, separated by the metopic (frontal) suture. Metopism is the condition of having a persistent metopic suture. Metopic suture is regularly obliterated, except at its lower part, by the eighth year, but infrequently persists throughout life.〔(【引用サイトリンク】title=II. Osteology. 5a. 3. The Frontal Bone. Gray, Henry. 1918. Anatomy of the Human Body. )〕 There is no single proven cause of metopism. The occurrence is from mild to serious situations. Visional, learning, and behavioral problems may happen in serious metopism. Some don't need any medical treatment. Surgery is a successful approach for those who need it. Treatment teams include: neurosurgeons, plastic surgeons, neurologists, oral and maxillofacial surgeons, audiologists, neuroscience nursing professionals, speech therapists, physical therapists, dentist, otolaryngologists, ophthalmologists, psychiatrists, psychologists and social workers.〔(【引用サイトリンク】title=Metopic Synostosis (Trigonocephaly) - Boston Children's Hospital )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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