You are watching: Forearm bone involved in formation of the elbow joint
The rounded distal finish of the humerus is divided into 2 joint procedures — the trochlea on the medial side and also the capitulum on the lateral side. The pulley-shaped trochlea develops a tight joint through the trochlear notch of the ulna surrounding it. Proceed Scrolling to Read more Below...
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ongoing From Above... on the lateral side, the concave finish of the head that the radius meets the rounded, convex capitulum to complete the elbow joint. The loosened union that the capitulum that the humerus and the head that the radius enables the radius to pivot as well as flex and extend. The pivoting that the radius enables for the supination and pronation the the hand at the wrist.
Like all various other synovial joints, a thin layer the smooth articular cartilage consist of the ends of the skeletal that kind the elbow joint. The share capsule the the elbow surrounding the joint to carry out strength and lubrication to the elbow. Slick synovial fluid produced by the synovial membrane that the joint capsule fills the hollow space between the bones and lubricates the joint to reduce friction and also wear.
An substantial network the ligaments surrounding the share capsule helps the elbow joint preserve its stability and resist mechanically stresses. The radial and also ulnar collateral ligaments connect and maintain the place of the radius and ulna loved one to the epicondyles of the humerus. The annular ligament of the elbow extends indigenous the ulna roughly the head that the radius to hold the bones of the reduced arm together. These ligaments enable for movement and also stretching the the elbow while resisting dislocation the the bones.
Being a hinge joint, the only movements permitted by the elbow room flexion and also extension of the joint and rotation that the radius. The variety of motion of the elbow is restricted by the olecranon of the ulna, so that the elbow can only expand to approximately 180 degrees. Flexion of the elbow is limited only by the compression soft tissues bordering the joint.
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Because so countless muscles originate or insert near the elbow, the is a typical site because that injury. One typical injury is lateral epicondylitis, additionally known as tennis elbow, which is an inflammation bordering the lateral epicondyle of the humerus. Six muscles that regulate backward movement (extension) that the hand and also fingers originate ~ above the lateral epicondyle. Recurring strenuous striking while the muscles are contracted and versus force — such together that developing with the backhand punch in tennis — reasons strain on the tendinous muscle attachments and also can develop pain roughly the epicondyle. Remainder for these muscles will commonly bring about recovery.