Cubiti

Cubiti is a term used in anatomy to refer to the elbow region. In Latin, cubitus means the elbow, and cubiti is the plural or genitive form that appears in some medical texts. The term is most often encountered in descriptions of the elbow joint and surrounding structures.

The elbow, or articulatio cubiti, comprises three joints that work together: the humeroulnar joint between the distal humerus and the proximal ulna, the humeroradial joint between the distal humerus and the proximal radius, and the proximal radioulnar joint between the radius and ulna. These joints allow a combination of hinge-like flexion and extension with forearm rotation (pronation and supination). The bony landmarks include the olecranon, coronoid process, medial and lateral epicondyles, and the radial head.

Stability is provided by ligaments, including the ulnar collateral ligament medially, the radial collateral ligament laterally, and the annular ligament encircling the radial head. The musculature around the elbow includes flexors such as the biceps brachii and brachialis, extensors like the triceps brachii, and muscles enabling rotation such as the pronator teres and supinator. The median, musculocutaneous, and radial nerves contribute to motor and sensory innervation in the region, with the ulnar nerve passing near the medial elbow.

Clinical relevance includes injuries such as olecranon fractures, distal biceps tendon tears, lateral and medial epicondylitis, and cubital tunnel syndrome (ulnar nerve entrapment). Diagnosis often relies on physical examination, radiographs, and may use ultrasound or MRI for soft tissues. Variants include cubitus valgus or varus deformities affecting elbow alignment.