The first (lumbarized) sacral inferior vertebral notches are deep notches on the inferior surface of the pedicles, between the vertebral body and inferior articular processes.  Together with the superior vertebral notch of S2, they form intervertebral foramina, which transmit the first sacral spinal nerves and their coverings, spinal arteries, venous plexuses and recurrent meningeal (sinu-vertebral) nerves.  Further, the dorsal root ganglia lie partly in the foramina.