The surface is bounded by two prominent borders ( the anterior and posterior colliculi ), continuous above with the interosseous crest; they afford attachment to the anterior and posterior ligaments of the lateral malleolus.
2.
The "'postero-medial border "', sometimes called the oblique line, begins above at the medial side of the head, and ends by becoming continuous with the interosseous crest at the lower fourth of the bone.
3.
The "'antero-medial border "', or interosseous crest, is situated close to the medial side of the preceding, and runs nearly parallel with it in the upper third of its extent, but diverges from it in the lower two-thirds.
4.
The interosseous crest ( " crista interossea; external or interosseous border " ) begins above by the union of two lines, which converge from the extremities of the radial notch and enclose between them a triangular space for the origin of part of the Supinator; it ends below at the head of the ulna.
5.
The "'interosseous crest or lateral border "'is thin and prominent, especially its central part, and gives attachment to the interosseous membrane; it commences above in front of the fibular articular facet, and bifurcates below, to form the boundaries of a triangular rough surface, for the attachment of the interosseous ligament connecting the tibia and fibula.
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