Types of skull sutures :

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Types of skull sutures

1. Metopic or frontal suture Separates the frontal
   bone into two halves.
2. Sagittal suture separates the two parietal
   bones and extends from the anterior fontanelle to
   the posterior fontanelle.
3. CoronaL suture Separate the frontal bones from
   the parietal ones.
4. lambdoid suture Separate the posterior edge of
   the parietal bone from the occipital bone.
5. Squamosal suture Occupied the superior border
   of the squamous part of the temporal bone.
   Articulate anteriorly with sphenoid , superiorly
   with parietal bone and posteriorly with occipital
   bone.

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Skull Abnormalities

• Craniosynotosis Premature closure of the cranial
  suture result in overgrowth of the cranial
  bones.This may be simple in case of one suture
  defects or complex in case of more than one
  suture.
• Scaphocephaly Premature fusion of the sagittal
  suture.
• Plagiocephaly classified into different kinds
  such as 1. Frontal plagiocephaly (caused by
  unilateral coronal synostosis). 2. Occipital
  plagiocephaly ( caused by unilateral synostosis
  of the lambdoid suture). 3. Parallelism A
  distinct deformity in frontal and occipital
  bones.
• Acrania Partial or complete absence of skull (
  anencephaly).
• Cranioschisis Incomplete formation of the skull
  with defective development of the brain and often
  an encephalocoele or meningocoele.
• Acrocephaly ( tower head or skull) The top of
  the head is pointed or conical due to premature
  closure of the coronal and lambdoid sutures .
• Macrognathia Abnormally enlarged jaws.
• Maxillary protrusion Prolongation of both
  maxilla and mandible.
• Micrognathia reduced mandible.

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Anencephaly