What is the name of the large bone on the small finger side of the forearm?

The large bone located on the small finger side of the forearm is known as the ulna. It runs parallel to the radius, which is the bone on the thumb side of the forearm. The ulna plays a crucial role in the structure of the arm, providing stability and serving as a point of attachment for muscles, while also forming the elbow joint along with the humerus (the bone of the upper arm) and the radius.

In contrast, the radius is significant for wrist movement and is situated on the thumb side. The humerus, meanwhile, is the bone of the upper arm and is not located in the forearm at all. The carpus refers to the wrist bones, which are distinct from both the ulna and radius. Understanding these anatomical details is key for recognizing the functions and locations of different bones in the forearm.