"The entry point to the pedicle." In the lumbar spine, the base of the superior facet often overlies the entry point to the pedicle of the same level. The superior facet can be rongeured off to expose the bleeding cancellous bony area, which marks the entry site to the pedicle.
Sarwahi et al. Scoliosis 2011 6:16 doi:10.1186/1748-7161-6-16