What is ulna?
ulna is a bone in a human forearm. As the wrist approaches, it is wider near the elbow and narrows, located along the bone with a radius on the side of the arm's arm. The structure of this bone reflects its function because it consists of three main joints in the arm, two with a parallel radius of the bone and the other with a humerus bone in the upper arm. It is the elbow joint and it is the shape of the crescent key on the upper part of the ulna, which allows flexion and extension or bending and straightening the elbow, because the bones depend around the end of the humerus.
Long and narrow bone, which has a more fruity than cylindrical shape, the ulna extends the length of the forearm from the olecranone process, the bone protrusion at the proximal end of the bone felt in the elbow, to the styloid process, process, less bone meaning, bone importance on the impact. The Olecranon process acts as a place of attachment for several main arm muscles, including triceps brachii andFlexor Carpi Ulnaris. It also prevents hyperextension of the elbow. Just below it on the front aspect of the ulna is a coronoid process, a smaller, pointed projection, which serves as a place of connection for muscles of brachialis, pronator teres and flexor digitorum. This process curves into a notch of humerus, coronoid fossa when the elbow bends.
other important anatomical features of this bone include a semilunar notch, a crescent -shaped cavity between olecranone and coronoid processes in which the end of the humerus is inserted in the creation of the elbow joint; and a radial notch, concave surface on the side of the ulna, which is articulated with the head of the radius to form a proximal Radioul joint. The proximal radioulnar joint allows the forearm to be rotated as a radius head, which is bound to the Ulu ligament in the shape of a ring known as an annular ligament, turning back and forth against the radial notch. This rotation, which results in manual rotation and palm and palm, is known as pronation and supination.
on the distal conCi Ulny near the wrist is the head of the ulna, which forms a joint with a radius along its ulnar -cut, which reflects the proximal Radioul's joint. The distal Radioulnar joint, as well as the proximal joint above it, allows both bones to turn around each other and turn the hands of a palm or palm. Slightly extends behind the head of the ulna on its media side is the styloid process, bony eminence, which serves as a place of connection for ulnar collateral ligament of the wrist. This ligament stabilizes the wrist against bending too far or towards the side of the thumb.