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Asterion (anatomy)

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Asterion
Side view of head, showing surface relations of bones. (Asterion visible at center right.)
Details
Part ofSkull
SystemSkeletal
Identifiers
Latinasterion
TA98A02.1.00.020
TA2422
FMA76625
Anatomical terminology

The asterion is a meeting point between three sutures between bones of the skull. It is an important surgical landmark.

Structure

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In human anatomy, the asterion is a visible (craniometric) point on the exposed skull. It is just posterior to the ear. It is the point where three cranial sutures meet:

It is also the point where three cranial bones meet:

In the adult, it lies 4 cm behind and 12 mm above the center of the entrance to the ear canal.[citation needed] Its relation to other anatomical structures is fairly variable.[2]

Clinical significance

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Neurosurgeons may use the asterion to orient themselves, in order to plan safe entry into the skull for some operations, such as when using a retro-sigmoid approach. The asterion marks the junction of the transverse and the sigmoid sinuses[1][3]

Etymology

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The asterion receives its name from the Greek ἀστέριον (astērion), meaning "star" or "starry".

The Mercedes point is an alternative term for the asterion, for its resemblance to the Mercedes-Benz logo.

References

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  1. ^ a b c d Ucerler, Hulya; Govsa, Figen (2006-10-01). "Asterion as a surgical landmark for lateral cranial base approaches". Journal of Cranio-Maxillofacial Surgery. 34 (7): 415–420. doi:10.1016/j.jcms.2006.05.003. ISSN 1010-5182. PMID 16963269 – via ScienceDirect.
  2. ^ Avci, Emel; Kocaogullar, Yalcin; Fossett, Damirez; Caputy, Anthony (2003-05-01). "Lateral posterior fossa venous sinus relationships to surface landmarks". Surgical Neurology. 59 (5): 392–397. doi:10.1016/S0090-3019(03)00037-5. ISSN 0090-3019. PMID 12765815 – via ScienceDirect.
  3. ^ Babacan S, Yildiz-Yilmaz M, Kafa IM, Coşkun I (2019). "The Surface and Intracranial Location of Asterion". J Craniofac Surg. 30 (8): e753–e755. doi:10.1097/SCS.0000000000005757. PMID 31689738. S2CID 207889825.