Final answer:
The cuneiform closest to the big toe is the medial cuneiform, which is anterior to the navicular bone and provides support to the medial side of the foot.
Step-by-step explanation:
The cuneiform that is closest to the big toe is the medial cuneiform. In the architecture of the foot, anterior to the navicular bone, there are three cuneiform bones named according to their placement. These include the medial (closest to the big toe), intermediate, and lateral cuneiform bones. The medial cuneiform articulates with the navicular bone posteriorly and with the first and second metatarsal bones anteriorly. It supports and provides stability to the medial side of the foot, particularly the arch area closest to the big toe.