ANATOMY

Detailed explanation-1: -Your arm is made up of three bones: the upper arm bone (humerus) and two forearm bones (the ulna and the radius).

Detailed explanation-2: -The ulna is located on the medial side of the forearm, and the radius is on the lateral side. These bones are attached to each other by an interosseous membrane.

Detailed explanation-3: -Functionally, the radius and ulna together serve as the primary support structure of the forearm articulating with the humerus and carpal bones as described above. Both bones also serve as origins and insertions for muscles responsible for flexion and extension of the forearm, wrist, and fingers.

Detailed explanation-4: -Your ulna and radius are the two bones that make up your forearm. They share the functions that let your arm and wrist move. The ulna is slightly longer than the radius. It’s on the same side of your forearm as your pinkie fingers.

Detailed explanation-5: -Proximally the ulna articulates with the humerus and the radius. Distally it contacts the carpus or wrist. The trochlear notch is the deep semicircular surface for articulation with the trochlea of the humerus. The olecranon is the squared process extending proximal to the trochlear notch.