Cubitus

Belgique - Brabant wallon - Limal - Cubitus - 01

Cubitus Cover

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Cubitus refers to the anatomical term associated with the forearm or specifically to one of the bones in the forearm. In human anatomy, the term is often used interchangeably with the ulna, one of the two long bones within the forearm, the other being the radius. The cubitus or ulna extends from the elbow to the smallest finger, and when in the anatomical position, it is situated on the medial side of the forearm. It plays a crucial role in the movement and stability of the forearm and the hand.

Anatomy and Function

The ulna is a key component of the forearm's structure, providing a surface for articulation with the humerus in the upper arm to form the elbow joint, and with the radius to form the proximal and distal radioulnar joints. These articulations allow for the pivotal movements of the forearm, such as pronation and supination, where the forearm and hand are rotated inward or outward.

The upper end of the ulna features the olecranon and the coronoid process, which form part of the elbow joint and provide attachment points for muscles of the forearm and arm. The body of the ulna, slender and prismatic in form, varies in size and thickness throughout its length. The distal end of the ulna articulates with the radius and the triangular fibrocartilage complex (TFCC), contributing to the wrist joint's stability.

Clinical Significance

Injuries to the cubitus, such as fractures or dislocations, can significantly impact the forearm's functionality and range of motion. Conditions such as cubitus valgus, where the forearm deviates outward, and cubitus varus, an inward deviation, can arise from improper healing of fractures or congenital issues. Treatment for these conditions may involve physical therapy, bracing, or surgical intervention to restore normal alignment and function.

See Also

• Radius (bone)
• Elbow
• Forearm
• Joint
• Fracture

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