Translations:Elle/16/en

Ulna-Shaft

The shaft of the ulna is also called the corpus ulnae. The cross-section of this structure has a triangular shape. Thus along the Corpus ulnae there are three sides and edges. The Margo interosseus represents the side facing the radius. This is where the Membrana interossea antebrachii, which connects ulna and radius, comes in. Furthermore, this edge serves as separation of the posterior and anterior facies. At the posterior side of the ulna the Margo posterior runs. This runs from the olecranon down to the proc. styloideus at the caput ulnae. Adjacent to this edge are the posterior and medial facies. The medial surface does not have a continuous uniform shape. At the proximal end, the surface is significantly wider than at the distal end. The facies posterior also changes its structure over time. It has a broad and concavely curved part at the end close to the body. This changes in the middle to a narrower, convex surface. The distal end of this surface is then rounded and flat.