Emissary veins
Emissary veins | |
---|---|
Details | |
Identifiers | |
Latin | vena emissaria |
TA98 | A12.0.00.033 A12.3.05.301 |
TA2 | 4872 |
FMA | 50790 |
Anatomical terminology |
The emissary veins connect the extracranial venous system with the intracranial venous sinuses. They connect the
Emissary veins have an important role in selective cooling of the head. They also serve as routes where infections are carried into the cranial cavity from the extracranial veins to the intracranial veins.
There are several types of emissary veins including the posterior condyloid, mastoid, occipital and parietal emissary veins.[1]
Structure
There are also emissary veins passing through the foramen ovale, jugular foramen, foramen lacerum, and hypoglossal canal.[citation needed]
Function
Because the emissary veins are valveless, they are an important part in selective brain cooling through bidirectional flow of cooler blood from the evaporating surface of the head. In general, blood flow is from external to internal[2] but the flow can be altered by increased intracranial pressure.
Clinical significance
One notable emissary vein, the
Rupture of an emissary vein can result in a subgaleal hemorrhage, a rare but serious injury most often seen as a complication of vacuum extraction.[5]
See also
References
- ^ PMID 33085343. NBK563196.
- ^ Bajzer, Christopher (2004). "Cerebral vascular venous drainage". Remedica – via NCBI.
- PMID 3143245.
- ISBN 9781420008685. Retrieved 2014-12-10.
- PMID 7420661. Retrieved 11 May 2020.