the ulna – connects the elbow to the wrist on the little finger side of the hand

(Pronounced ul-nuh)

To remember the meaning of the ulna, remember that it connects to the little finger side of the hand, and use the following mnemonic:

The ulcers on the nun (ulna) covered her arm from her elbow to her little finger.

The ulna is one of the two long bones in the forearm, running parallel to the radius from the elbow to the wrist on the little finger side of the hand. 

At the elbow joint, the ulna forms the primary connection with the humerus through a hinge joint. The ulna is the larger and more stable of the two forearm bones and serves as the main structural support for the forearm, while the radius rotates around it during the movements that allow the hand to turn palm up or palm down. 

The ulna provides attachment sites for numerous muscles that control elbow flexion and extension, as well as wrist and finger movements, including the flexor and extensor muscles of the forearm. 

Along with the radius, the ulna helps form the framework that supports the hand and allows for the complex manipulative abilities of the human upper limb, making it essential for activities requiring precise hand and wrist control.