The sweep or spiral bone is one of the two vast bones of the lower arm, the other being the ulna. It reaches out from the sidelong side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The radius is a part of two joints: the elbow and the wrist. On the elbow, it joins with the capitalism of the humerus, and in a separate region, with the ulna at the radial notch. On the wrist, the radius forms a joint with the ulna bone. 该 radius bone is the lateral [on side of the thumb and barely shorter of the two forearm bones. It rotates to produce the motion supination and pronation of the forearm. Those moves are important to many everyday responsibilities consisting of writing, 画画, and throwing a ball. The radius pivots across the ulna to provide motion on the proximal and distal radio-ulnar joints.
The Upper End of Radius Bone
The topmost part of the radius bone is disc formed and is known as head of the radius. It’s far covered with hyaline cartilage. It has the advanced concave floor which articulates with the capitalism of the humerus at the elbow joint. The circumference of the pinnacle is also articular and articulates with the radial notch of the ulna and the annular ligament, accordingly forming the advanced radioulnar joint.
The head maintains beneath as neck that is enclosed by the slim lower margin of the annular ligament. The top and neck are unfastened from capsular attachment and can rotate freely inside the socket. A bony prominence known as tuberosity of radius lies just under the media a part of the neck. It has a difficult posterior part and an easy anterior component. It gives attachment to the biceps tendon.
The Shaft of Radius Bone
Distal to the elbow, the body of the radius continues in an immediate line along the lateral facet of the forearm earlier than all at once widening simply above the wrist joint. The radial shaft expands in diameter as it moves distally. Much like the ulna, it’s far triangular in shape, with three borders and 3 面. Inside the middle of the lateral surface, there’s a small roughening for the attachment of the pronator teres muscle. It has 3 borders and three surfaces.
The anterior border extends from the anterior margin of the radial tuberosity to the styloid technique. it is indirect in the higher half of the shaft, and vertical within the decrease half of.
The oblique part is called the anterior oblique line.
The lower vertical part is crest like
The posterior border i is clearly described best in its middle one 1/3. The top indirect component is known as the posterior oblique line.
The medial (or interosseous) border is the sharpest of the 3 borders. It extends from the radial tuberosity to the posterior margin of the ulnar notch. The interosseous membrane is attached to its decrease three fourths.