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=== Radius shaft===
The profile of the corpus radii has an almost three-sided shape. The Margo interosseus is medially directed, at this edge the Membrana interossea antebrachii is attached. It is located between the anterior and posterior facies. The lateral facies has a roughness of varying degrees in the middle third of the shaft, the pronator tuberosity, which is where the pronator teres muscle comes in. The lateral facies is separated from the posterior facies by the posterior margo.