The maxillae (plural: maxillae /mækˈsɪliː/) consist of upper palate of mouth or maxilla (/mækˈsɪlə/); or two halves that are fused at the intermaxillary suture to form the upper jaw. This is similar to the mandible (lower jaw), which is also a fusion of two halves at the mandibular symphysis.

Tripathi et al., describe fixation at the maxilla for spinal radiosurgery.

They have treated two patients at the upper cervical spine up to C3 cervical vertebra by fixing anterior pillars of the Leksell stereotactic system at the maxilla. To ensure cervical immobilisation and precision of treatment, the neck was immobilised with a Philadelphia collar. The relative position between the head and sternum with the couch from image acquisition to the radiation delivery was kept constant. Docking angle was kept neutral (90 degrees) throughout the treatment (from image acquisition to actual treatment).

The maxilla is a potential alternative for stereotactic frame fixation. Measures to ensure cervical immobilisation with lower-down frame position permits treatment of lesions as low as C3 vertebra ¹⁾.