Basion

Dr Craig Hacking et al.

The basion is the median (midline) point of the anterior margin of the foramen magnum. The apical ligament attaches to it.

It is one of the skull landmarks, craniometric points for radiological or anthropological skull measurement.

Clinical importance

Various lines and measurements using the basion are made in the diagnosis of atlanto-occipital dissociation (AOD) injuries, platybasia and basilar invagination:

Anatomy: Head and neck
Share article

Article information

rID: 40452
Section: Anatomy
Synonyms or Alternate Spellings:

Support Radiopaedia and see fewer ads

Cases and figures

  • Skull landmarks (annotated images)
    Drag here to reorder.
  • Updating… Please wait.

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

     Thank you for updating your details.