Last Updated: March 25, 2020
The foramen magnum is located in the occipital bone, which has three parts: a squamosal part located behind the foramen magnum; a basal (clival) portion located anterior to the foramen magnum; and a condylar part that connects the squamosal and clival parts (Fig. 6.1). The suboccipital approaches are directed through the squamosal part and the anterior approaches through the clival part. The condylar part, which includes the occipital condyle, post...