The Second Metatarsal Bone (os metatarsale II) is the longest of the metatarsal bones, being prolonged backward into the recess formed by the three cuneiform bones.
Its base is broad above, narrow and rough below. It presents four articular surfaces: one behind, of a triangular form, for articulation with the second cuneiform; one at the upper part of its medial surface, for articulation with the first cuneiform; and two on its lateral surface, an upper and lower, separated by a rough non-articular interval. Each of these lateral articular surfaces is divided into two by a vertical ridge; the two anterior facets articulate with the third metatarsal; the two posterior (sometimes continuous) with the third cuneiform. A fifth facet is occasionally present for articulation with the first metatarsal; it is oval in shape, and is situated on the medial side of the body near the base.
See Metatarsal Bones for a description of the common characteristics of metatarsal bones.
The base articulates with all three cuneiforms. The head with the 1st phalanx of second toe.