Proatlantal intersegmental artery

Dr Henry Knipe et al.

The type I proatlantal artery (or proatlantal intersegmental artery) can be differentiated from a type II on the basis of its origin, which is the internal carotid artery for the former and external carotid artery for the latter. 

Differential diagnosis

It can be easily confused for another persistent carotid-vertebrobasilar anastomosis, the persistent hypoglossal artery but a key differentiator is that the type I proatantal artery courses through the foramen magnum whereas the persistent hypoglossal artery courses through the hypoglossal canal

Share article

Article Information

rID: 26817
System: Vascular
Section: Anatomy
Synonyms or Alternate Spellings:
  • Type I proatlantal artery

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.