Which body parts are the humerus, ulna, and radius?
May 14, 2023
Source: Cainiu Health
Dr. Lin Yunfei
Introduction
The humerus, ulna, and radius are three long bones in the upper limb skeleton of the human body. The humerus is the largest and longest among them, located respectively in the upper arm and forearm. These bones are important components of the human upper limb. Their structure and articulations form the elbow joint and the forearm skeleton, providing solid support for normal arm movement and muscular activity.
Under normal circumstances, the humerus, ulna, and radius are three long bones in the human upper limb skeleton, located in the upper arm and forearm regions, respectively. A detailed analysis is as follows:
1. Humerus
The humerus is the longest and largest bone in the upper arm, situated in the brachial region. It forms the shoulder joint with the scapula and connects with the ulna and radius to form the elbow joint. Its primary functions include providing stability to the elbow joint and supporting movements of the shoulder and arm, such as lifting and swinging objects, and bringing objects toward the body.
2. Ulna
The ulna is located on the medial side of the radius. It connects with both the radius and the humerus to form the elbow joint. Its main function is to support the wrist and palm, enabling flexion and rotation of the hand.
3. Radius
The radius is located on the lateral side of the ulna. It connects with the ulna and the humerus to form the elbow joint. Its primary functions include supporting the wrist and palm, as well as facilitating rotation of the forearm.
The humerus, ulna, and radius are essential bones that constitute the human upper limb. Their structure and articulations form the elbow joint and the forearm skeleton, providing strong support for normal arm movement and muscular activity.
