Learn more. At its upper end it has a hook-like process, the olecranon, that fits into a hollow at the back of the lower end of the upper arm bone (the humerus) and prevents the elbow from over-extending. Distally, the ulna articulates with the radius, forming the distal radio-ulnar joint. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Ulna: The larger of the two long bones within the forearm. The ulna is a long bone in the forearm. The radius is the lateral of the two bones, which makes the ulna the medial bone of the forearm. The ulna is on the same side of the arm as the little finger. Learn more. Structure This nerve is one of the branches of the brachial plexus, and it arises from the C8 and T1 nerve roots. ulna One of the pair of forearm long bones. It runs parallel to the radius, which is the lateral bone of the forearm (Figure 2). It lies medially and parallel to the radius, the second of the forearm bones.The ulna acts as the stabilising bone, with the radius pivoting to produce movement.. Proximally, the ulna articulates with the humerus at the elbow joint. home / medterms medical dictionary a-z list / ulna definition Medical Definition of Ulna. (The other, shorter bone of the forearm is the radius. Definition. Ulna, inner of two bones of the forearm when viewed with the palm facing forward. ulna meaning: 1. a long, thin bone in the lower part of your arm 2. a long, thin bone in the lower part of your…. The proximal end of the ulna resembles a crescent wrench with its large, C-shaped trochlear notch.This region articulates with the trochlea of the humerus as part of the elbow joint. Ulna definition is - the bone on the little-finger side of the human forearm; also : a corresponding part of the forelimb of vertebrates above fishes. The ulnar nerve, sometimes called the ‘funny bone,’ is one of the three main nerves in the human arm. The ulna is the medial bone of the forearm. Anatomy . Not including: head of ulna; ulnar notch of radius Learn with flashcards, games, and more — for free. The ulnar nerve is a long nerve, running through the whole arm. (The smaller one is the radius.) ulna definition: 1. a long, thin bone in the lower part of your arm 2. a long, thin bone in the lower part of your…. The radius and the ulna constitute as the bones of the forearm.The antebrachial region, as it is clinically known, spans the length of the region which extends roughly from elbow to wrist. The ulna is on the little finger side. It has both motor and sensory functions and provides motor function to most of the hand, including the fine movements of the fingers. Throughout its pathway from the shoulder down to the hand, it divides into several motor and sensory branches. 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