Guest lecture: Urofacial development

4 important questions on Guest lecture: Urofacial development

What is holoprosencephaly (HPE)?

Mid-facial malformation (most forebrain)
Mostly defects of olfactory or tract

Defect in cells receiving SHH signals

these people mostly have very symmetric face (tom cruise? ;p)

Division of bones in head and neck

Neurocranium
  • cranial base (bones underlying the brain)
  • Cranial vault (bones covering the brain)
  • Sensory capsules (bones encapsulating the sensory organs)


Viscerocranium
  • Bones of the face and pharyngeal arches

Formation of skull bones

Enchondral ossification -> enchondral bone
  • development out of cartilage precursors


Intramembranous ossification -> dermal bone
  • development from an ossification directly in the mesenchyme.
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The skull

Sutures

  • strong, unfused
  • the sutures gradually ossify to join the skull bones together


Fontanelles
  • soft spots on the head
  • fontanelles close

What is a craniosynosthosis?
Premature closure of sutures.
closure of one suture causes increased growth at other sutures, thereby deforming the brain and skull.

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