Medial cuneiform skeletal
If you slide your index finger proximally along the medial surface of the shaft of the first metatarsal you will note that the bone flares at its base. Just proximal to this flare, is the location of the medial cuneiform bone. Another way to identify the medial cuneiform is to ask your subject to activate their tibialis anterior tendon by supinating and dorsiflexing their foot. The tibialis anterior tendon will become prominent with this action exposing its insertion point - the anteroinferior aspect of the medial cuneiform.