Wormian bones at lambdoid suture.
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| Caption2 =Skull of a 21-year-old man with Wormian bones |
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'''Wormian bones''', also known as '''intra sutural bones''',<ref><radiopaedia.org/articles/wormian-bones>{{cite book|last=Saladin |first=Kenneth |title=Anatomy & Physiology: The Unity of Form & Function |edition=4th |date=August 2006 |publisher=McGraw-Hill |isbn=0-07-331608-3 }}</ref> are extra bone pieces that occur within a [[suture (joint)]] in the [[human cranium|cranium]]. These are irregular isolated bones that appear in addition to the usual centers of [[ossification]] of the cranium and, although unusual, are not rare.<ref>{{cite book|last=Gray|first=Henry|author2=Warren Harmon Lewis |title=Anatomy of the Human Body|publisher=Lea & Febiger|year=1918}}</ref> They occur most frequently in the course of the [[lambdoid suture]], which is more tortuous than other sutures. They are also occasionally seen within the sagittal and coronal sutures. A large wormian bone at lambda is often called an [[Interparietal bone|Inca bone (Os Incae)]],<ref>{{cite journal |title=Radiological Case of the Month |url=http://archpedi.ama-assn.org/cgi/content/full/155/6/731 |pmid=11386967 |accessdate=2008-11-02 |doi=10.1001/archpedi.155.6.731 |year=2001 |last1=Parente |first1=K |last2=Mercado-Deane |first2=MG |last3=Brummund |first3=T |volume=155 |issue=6 |pages=731–2 |journal=Archives of pediatrics & adolescent medicine}}</ref> due to the relatively high frequency of occurrence in Peruvian mummies. Another specific wormian bone, the [[pterion]] [[ossicle]], sometimes exists between the [[sphenoid bone|sphenoidal angle]] of the [[parietal bone]] and the great wing of the [[sphenoid bone]].<ref>{{cite web|url=http://www.geocities.com/akramjfr/sutural.html|title=Sutural bones|author=Dr. Akram Abood Jaffar|archiveurl=https://www.webcitation.org/query?url=http://www.geocities.com/akramjfr/sutural.html&date=2009-10-25+12:10:44|archivedate=2009-10-25}}</ref> They tend to vary in size and can be found on either side of the skull. Usually, not more than several are found in a single individual, but more than one hundred have been found in the skull of a [[Hydrocephalus|hydrocephalic]] adult. |
'''Wormian bones''', also known as '''intra sutural bones''',<ref><radiopaedia.org/articles/wormian-bones>{{cite book|last=Saladin |first=Kenneth |title=Anatomy & Physiology: The Unity of Form & Function |edition=4th |date=August 2006 |publisher=McGraw-Hill |isbn=0-07-331608-3 }}</ref> are extra bone pieces that occur within a [[suture (joint)]] in the [[human cranium|cranium]]. These are irregular isolated bones that appear in addition to the usual centers of [[ossification]] of the cranium and, although unusual, are not rare.<ref>{{cite book|last=Gray|first=Henry|author2=Warren Harmon Lewis |title=Anatomy of the Human Body|publisher=Lea & Febiger|year=1918}}</ref> They occur most frequently in the course of the [[lambdoid suture]], which is more tortuous than other sutures. They are also occasionally seen within the sagittal and coronal sutures. A large wormian bone at lambda is often called an [[Interparietal bone|Inca bone (Os Incae)]],<ref>{{cite journal |title=Radiological Case of the Month |url=http://archpedi.ama-assn.org/cgi/content/full/155/6/731 |pmid=11386967 |accessdate=2008-11-02 |doi=10.1001/archpedi.155.6.731 |year=2001 |last1=Parente |first1=K |last2=Mercado-Deane |first2=MG |last3=Brummund |first3=T |volume=155 |issue=6 |pages=731–2 |journal=Archives of pediatrics & adolescent medicine}}</ref> due to the relatively high frequency of occurrence in Peruvian mummies. Another specific wormian bone, the [[pterion]] [[ossicle]], sometimes exists between the [[sphenoid bone|sphenoidal angle]] of the [[parietal bone]] and the great wing of the [[sphenoid bone]].<ref>{{cite web|url=http://www.geocities.com/akramjfr/sutural.html|title=Sutural bones|author=Dr. Akram Abood Jaffar|archiveurl=https://www.webcitation.org/query?url=http://www.geocities.com/akramjfr/sutural.html&date=2009-10-25+12:10:44|archivedate=2009-10-25}}</ref> They tend to vary in size and can be found on either side of the skull. Usually, not more than several are found in a single individual, but more than one hundred have been found in the skull of a [[Hydrocephalus|hydrocephalic]] adult. |
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| Wormian bones (Sutural bones) | |
|---|---|
Wormian bones compared to a normal skull
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Skull of a 21-year-old man with Wormian bones
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| Details | |
| Identifiers | |
| Latin | Ossa suturale |
| TA98 | A02.1.00.043 |
| TA2 | 831 |
| FMA | 59327 |
| Anatomical terms of bone | |
Wormian bones, also known as intra sutural bones,[1] are extra bone pieces that occur within a suture (joint) in the cranium. These are irregular isolated bones that appear in addition to the usual centers of ossification of the cranium and, although unusual, are not rare.[2] They occur most frequently in the course of the lambdoid suture, which is more tortuous than other sutures. They are also occasionally seen within the sagittal and coronal sutures. A large wormian bone at lambda is often called an Inca bone (Os Incae),[3] due to the relatively high frequency of occurrence in Peruvian mummies. Another specific wormian bone, the pterion ossicle, sometimes exists between the sphenoidal angle of the parietal bone and the great wing of the sphenoid bone.[4] They tend to vary in size and can be found on either side of the skull. Usually, not more than several are found in a single individual, but more than one hundred have been found in the skull of a hydrocephalic adult.
Wormian bones are a marker for some diseases and important in the primary diagnosis of brittle bone disease: osteogenesis imperfecta.[5]
Wormian bones may also be seen in:
The causes can be remembered by the mnemonic "PORKCHOPS".[6]
Wormian bones are named for Ole Worm, professor of anatomy at Copenhagen, 1588–1654. He taught Latin, Greek, physics and medicine. His description of the extra-sutural bones contributed to the science of embryology.
