Articulatio cubiti

Articulatio Cubiti is the Latin term for the elbow joint, a synovial hinge joint that connects the humerus in the upper arm to the ulna and radius in the forearm. This joint allows for the flexion and extension of the forearm relative to the upper arm, as well as rotation of the forearm and wrist.

Anatomy

The articulatio cubiti is composed of three separate articulations: the humeroulnar joint, the humeroradial joint, and the proximal radioulnar joint. Each of these articulations contributes to the overall function of the elbow.

Humeroulnar Joint

The humeroulnar joint is the articulation between the trochlea of the humerus and the trochlear notch of the ulna. This joint is responsible for the flexion and extension of the forearm.

Humeroradial Joint

The humeroradial joint is the articulation between the capitulum of the humerus and the head of the radius. This joint contributes to both the flexion and extension of the forearm as well as its rotation.

Proximal Radioulnar Joint

The proximal radioulnar joint is the articulation between the head of the radius and the radial notch of the ulna. This joint allows for the rotation of the forearm, which in turn allows for the rotation of the wrist.

Function

The primary function of the articulatio cubiti is to allow for the flexion and extension of the forearm. This is achieved through the combined actions of the humeroulnar and humeroradial joints. In addition to this, the articulatio cubiti also allows for the rotation of the forearm and wrist, a function provided by the proximal radioulnar joint.

Clinical Significance

Due to its complex structure and high usage, the articulatio cubiti is susceptible to a variety of injuries and conditions. These can include tennis elbow, golfer's elbow, and elbow arthritis, among others. Treatment for these conditions can range from physical therapy and medication to surgery in severe cases.