Supraodontoid space

Last revised by Francis Deng on 18 Jan 2022

The supraodontoid space, also known as the supradental space or apical cave, is an extradural space at the anterior craniocervical junction superior to the odontoid process of C2 (dens axis).

Gross anatomy


The space is a cave-shaped region facing posteriorly with the following boundaries 1:


Contents encountered from anterior to posterior include the following 1:

Related pathology

In trauma patients, hemorrhage in the supraodontoid space presumably indicates apical ligament injury 2, and it is also a sign associated with tectorial membrane injury (termed the supradental space sign) 3.

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

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

 Thank you for updating your details.