sesamoid bone of the peroneus longus muscleGo to external page http://purl.obolibrary.org/obo/UBERON_0012104
a coffee bean-shaped constant, large and regular bone. The lateral surface of the bone is convex in all directions and non-articular. The medial surface is covered with hyaline cartilage and articulates by means of a synovial joint with the corresponding facet of the cuboid bone. The histological structure and the mode of ossification of the os peroneum are identical to that of other short bones of the skeleton.