Write down the anatomy of Ulna. Also explain its features and muscle attachments?
ULNA The ulna is the medial bone of the forearm. It is homologous with the fibula of the lower limb. It has an upper end, a shaft and a lower end. Features: Upper End: The upper end presents the olecranon and coracoid processes, and the trochlear and radial notches. The olecranon process projects upwards from the shaft. It has superior, anterior, posterior, medial and lateral surfaces. The anterior surface is articular, it forms the upper part of the trochlear notch. The posterior surface forms a triangular sub cutaneous area which is separated from the skin by a bursae. The medial surface is continuous inferiorly with the medial surface of the shaft. The lateral surface is smooth, continues as posterior surface of shaft. The superior surface in its posterior part shows a roughened area. 2. The Coracoid process projects forwards from the shaft just below the olecranon and has four surfaces. The superior surface forms the lower part of the trochlear notch. The anterior surface is tria