First metatarsal
Moving proximally from the head of the first metatarsal, the medial, dorsal and plantar surfaces of the first metatarsal shaft are palpable beneath the skin. You will note that the inferior surface of the first metatarsal is concave longitudinally. The lateral surface of the shaft of the first metatarsal is palpable by sliding your finger between the first and second toes into the first metatarsal interspace. You will need to apply firm pressure with your index finger in order to adequately palpate this surface.
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.