You are watching: Forearm bone involved in formation of elbow joint
The rounded distal end of the humerus is split into 2 joint processes — the trochlea top top the medial side and also the capitulum top top the lateral side. The pulley-shaped trochlea develops a chop joint through the trochlear notch that the ulna surrounding it. Continue Scrolling come Read more Below...
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continued From Above... ~ above the lateral side, the concave end of the head of the radius meets the rounded, convex capitulum to complete the elbow joint. The loose union that the capitulum of the humerus and the head that the radius enables the radius to pivot as well as flex and extend. The pivoting of the radius permits for the supination and also pronation the the hand in ~ the wrist.
Like all other synovial joints, a slim layer of smooth articular cartilage covers the end of the bones that form the elbow joint. The joint capsule the the elbow surrounds the share to provide strength and lubrication come the elbow. Slick synovial fluid produced by the synovial membrane the the joint capsule fills the hollow an are between the bones and also lubricates the joint to minimize friction and also wear.
An extensive network the ligaments neighboring the share capsule help the elbow joint keep its stability and also resist mechanical stresses. The radial and ulnar collateral ligaments connect and also maintain the place of the radius and also ulna loved one to the epicondyles of the humerus. The annular ligament the the elbow extends from the ulna about the head that the radius to host the skeletal of the reduced arm together. This ligaments allow for movement and stretching that the elbow while resisting dislocation of the bones.
Being a hinge joint, the only movements enabled by the elbow room flexion and extension of the joint and rotation of the radius. The variety of motion of the elbow is restricted by the olecranon the the ulna, so that the elbow can only prolong to roughly 180 degrees. Flexion of the elbow is minimal only by the compression soft tissues bordering the joint.
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Because so numerous muscles originate or insert close to the elbow, the is a typical site for injury. One common injury is lateral epicondylitis, also known as tennis elbow, which is an inflammation bordering the lateral epicondyle of the humerus. Six muscles that manage backward motion (extension) that the hand and also fingers originate on the lateral epicondyle. Repetitive strenuous striking when the muscles space contracted and versus force — such together that developing with the backhand stroke in tennis — reasons strain ~ above the tendinous muscle attachments and also can develop pain approximately the epicondyle. Rest for these muscles will generally bring about recovery.