Pterion• about 4 cm from zygomatic arch • about 3 cm from zygomatic frontal bone



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Pterion• about 4 cm from zygomatic arch

• about 3 cm from zygomatic frontal bone

• landmark for frontal / anterior branch of middle

meningeal arteryTrauma to the pterion can lead to tearing of the

meningeal branches of the middle meningeal

arteries.

The middle meningeal vessels lie between the dura

mater and the periosteum of the internal aspect of

the skull.

The build up of blood in this extradural space may

lead to:

Pterion


• brain shift away from hematoma

• compress against midbrain and displace downward

through opening of tentorium

• compress vasculature of midbrain and reticular formation



• decrease level of consciousness

• untreated hemorrhage may cause death in a few hour
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