Skull at birth, seen from above
Persistent frontal suture in adult human skull
|Anatomical terms of bone|
The frontal suture is a dense connective tissue structure that divides the two halves of the frontal bone of the skull in infants and children. It usually disappears by the age of six, with the two halves of the frontal bone being fused together. It is also called the metopic suture, although this term may also refer specifically to a persistent frontal suture (further detailed in section below).
If the suture is not present at birth because both frontal bones have fused (craniosynostosis), it will cause a keel-shaped deformity of the skull called "trigonocephaly."
It is present in a fetal skull so that the skull can bend and is very elastic at the time of birth. The baby's head bends when coming out of the mother's womb. The space is filled as the child grows older.
Persistent frontal suture
In some individuals the suture can persist (totally or partly) into adulthood, and in these cases it is referred to as a persistent metopic suture. The suture can either bisect the frontal bone and run from nasion to bregma or persist as a partial metopic suture (see image of frontal bone) (where part of the suture survives and is connected to either bregma or nasion) or as an isolated metopic fissure. Persistent frontal sutures are of no clinical significance, although they can be mistaken for cranial fractures. As persistent frontal sutures are visible in radiographs, they can be useful for the forensic identification of human skeletal remains. Persistent frontal sutures should not be confused with supranasal sutures (a small zig-zag shaped suture located at and/or immediately superior to the glabella).
- Page 497 in: Benz-Bohm, G.; Klaus-Dietrich Ebel (1999). Differential diagnosis in pediatric radiology. Stuttgart: Thieme. ISBN 3-13-108131-7.
- Medscape > Congenital Synostoses, by Silvio Podda, MD. Updated: Aug 18, 2010
- Dictionary.com > metopic suture in turn citing: The American Heritage, Stedman's Medical Dictionary, Copyright 2002
- Bademci G, Kendi T and Agalar F. 2007. "Persistent metopic suture can mimic the skull fractures in the emergency setting?" Neurocirugía 18: 238.
- Bademci G, Kendi T and Agalar F. 2007. "Persistent metopic suture can mimic the skull fractures in the emergency setting?" Neurocirugía 18: 238-240.
- "Frontal Suture." Stedman's Medical Dictionary, 27th ed. (2000). Stedman's/LWW 1570345
- Moore, Keith L. and T.V.N. Persaud. The Developing Human: Clinically Oriented Embryology, 7th ed. (2003).
- Pediatric Plastic Surgery, Mathes and Hetz. chapter 92; nonsyndromic craniostosis.
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