Ulna
Ulna
The Ulna (/ˈʌlnə/; from Latin ulna meaning "elbow") is one of the two long bones located in the forearm that extends from the elbow to the smallest finger. When the hand is facing upwards, the ulna is located on the inner aspect of the forearm. It runs parallel to the radius, the other long bone in the forearm, and is larger and longer than the radius.
Etymology
The term ulna is derived from the Latin word ulna, which means "elbow". This is likely due to the bone's proximity and connection to the elbow joint.
Anatomy
The ulna consists of a proximal end, a shaft, and a distal end. The proximal end features two important processes: the olecranon and the coronoid process. The olecranon forms the bony prominence of the elbow, while the coronoid process serves as the point of attachment for various muscles. The shaft of the ulna is triangular in cross-section, and the distal end connects to the carpal bones of the wrist.
Function
The ulna plays a crucial role in the functioning of the forearm. It provides structural support and facilitates various movements, including flexion and extension of the forearm at the elbow joint, and pronation and supination of the forearm and hand.
Related Terms
- Radius: The other long bone in the forearm, which runs parallel to the ulna.
- Olecranon: The bony prominence of the elbow, which is part of the ulna.
- Carpal bones: The group of bones in the wrist, which the ulna connects to at its distal end.
See Also
External links
- Medical encyclopedia article on Ulna
- Wikipedia's article - Ulna
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